I've been down this road so many times, I now have a rapid and effective procedure to doing this. It still takes a lot of time, so get a tall glass of drink, drink it, and then sit down.
First, once your PC is started, go to Start ->Control Panel, and Add/Remove Programs (Classic View). You will see a large list of stuff that's installed. Go through each one and start removing what you don't need. Things to keep:
Programs you use
Audio Drivers (Creative Sound Blaster, Intel Audio, etc.)
Graphics Drivers (Intel, ATi, nVidia)
Modem Drivers (v.90, v.92, usualy Lucent or Agere, maybe Conexant)
Network Drivers (Intel, Netgear, 3Com, National Semiconductor, etc.)
Adobe Flash Player
Windows Updates (i.e. Update for Windows XP [buncha-numbers])
Internet Explorer 7 (unless you don't like it for some reason)
Things that can go:
DELL Support
things that you never use
AOL !!!!! (unless you actually use it)
Trial Versions of Programs or Expired Apps (such as the McAfee or Norton Antivirus 30-day thing they gave you)
Look in your System Tray. This is in the bottom right next to your clock. If you see an arrow to the left of one or three icons, click it, and the real story begins. All those things you see down there are running in the background eating up space in your already choked up RAM. By hovering your mouse over each one, you can tell what it is. The procedure is different for each one, but here is the gist.
Right-click the icon, and choose one of the possible options:
Disable Autostart, Disable Quickstart, Options..., Preferences...
If you go to Options or Preferences, you will be given a menu, of which you have to find an option (by rummaging through tabs along the top and the like) that ha a checkbox that says something to the likes of "Run with Windows", or "Start with Windows", or "Autostart" or something along that line, and uncheck it. Or, it could be "Show Icon in System Tray" or something like that. OK out of the Options.
Things to keep in the System Tray:
Volume Control (unless your DELL has no working sound)
Network Icon (the two monitors that blink blue when you use the Internet)
Antivirus (if you don't have one, keep reading)
Anti-Spyware with a real-time protection
Drawing Tablet Icon
[name of printer here] Icon
Things that must go:
DELL Support
Quicktime
Any "Quickstart" Icon
Now, go to Start-> Programs -> Startup, and take a look at what's there. If you have "Adobe Reader Speed Launch", remove it. If you have any "Quick Start" Icons in here, remove them too.
We're getting there, now you have to download a program. Not to worry, it's very small, and won't bite. Go to www.ccleaner.com and download CCleaner. When you are installing it, do NOT install the Yahoo! Toolbar, uncheck that option. You don't need yet another toolbar in IE. When it is done, right-click your Recycle Bin and choose Open CCleaner...
You are now presented with the CCleaner window, and you have the option of cleaning out all the Temp files and cache that has accumulated, but first, go through the list and unchoose or choose certain options at your discretion.
First, Internet Explorer. If Cookies is checked, any websites that have customizable layouts, or automatically log you in will be logged out if you have this checked. However, this removes bad cookies too, the ones that track your surfing habits and the like. If History is checked, you will lose all your Browsing History. If you have Recenttly Typed URLs checked, you will not be able to go to a website by choosing it from the Address Bar's drop down list just after you run CCleaner. You can uncheck Last Download Location, and if you check Autocomplete Form History, you will lose ALL saved passwords, so you have to enter them again.
Next, Windows Explorer. Unless you actually use Recent Documents, that can remain checked. Same for everything else.
In the next section, System, you have an option at the bottom: Windows Log Files. These Log files are useful for finding out exactly what is happening if a program or your system is going sour, if you go to Start->Control Panel->Administrative Tools->Event Viewer, but if you never use it, leave it checked.
Last but not least Advanced. This can clear out any customizations done to your Desktop, so leave all unchecked except for IIS Log Files (same reasoning as the Windows one). Hotfix Uninstallers winn remove the uninstall files for all the Windows Updates since Service Pack 2. This can free up a lot of disk space, but if you need to uninstall a hotfix for some reason, you will be hosed if you check this. Check at your discretion.
Click the Applications tab. Here you will see some programs you may have installed. First thing, find Adobe Flash Player and uncheck it. If you use a different Web Browser than Internet Explorer, fix up the options like you did with IE.
When done, click Analyse, and after a few seconds (or a few minutes) it will tell you how many MB of temp files it can remove. Double check your options, and click Run CCleaner. It warns you about removing files, then clicking OK does it. When it says Cleaning Complete, close CCleaner.
From now on, all you have to do to use it again is right-click Recycle Bin, Run CCleaner. It won't show up in a window, but it will do its work right then. Wait a minute before doing something else.
Right-click Internet Explorer on your Desktop and choose Internet Properties, or go to Start -> Control Panel -> Internet Options (Classic View). Click Settings... in the middle where it says Temporary Internet Files, and change the number to 64. OK out of it.
You have one more thing to do in Windows. That is this.
Click Start -> All Programs -> Accessories -> System Tools -> Disk Defragmenter. When it opens, click your C: Drive and click Defragment. It may take a long while, but after it is done, your hard drive should run significantly faster. You may have to do it more than once.
Your DELL has 256 MB of memory. While this was OK for Windows 2000 and even Windows XP Gold, it is not good for XP Service Pack 2. This is one reason things are taking forever to boot. You need at least 512 MB or RAM to run XP smoothly.
To upgrade your RAM, you have to do a Google.com search with the words DELL [your exact model, i.e. Dimension 3000) RAM. The first 50,000 results will be shopping sites that will offer you the right memory. While you can buy from DELL, it is twice as expensive and not worth it. If your DELL has RDRAM, buy two 128 MB sticks, otherwise, buy a 512 stick.
To insert the RAM into your DELL, depending on the model, you unplug the system, put it on a workbench, and you either unscrew the large thumbscrew on the right side of the rear, or you push the grey button on the top rear and bottom rear of the case, then either slide the side panel off, or it opens like a clamshell.
Put your hand on the metal part of the case before doing anything.
When you look inside you will see a large circuit board, the motherboard, and near the rear is a large duct. In front of the duct, depending on the model, will be one or two vertical circuit board stick(s) like the one(s) you purchased. There should be one or two slots empty, or in the case of RDRAM, there are two "different like" sticks near the front. Push down the clips on both sides of the empty slot(s), and/or remove the last two boards if you have RDRAM. Either way, pull out your RAM stick(s), find the notch on the bottom, line it up with the groove in the empty slot(s), and insert it. Push down until the clips on either side lock into place. It requires some force to do so. Once it is firmly in place, close the clamshell or slide the side panel closed, and if applicable, screw in the thumb screw.
Plug the PC in and start it up. It should warn you that it has more RAM when you start it up. If it beeps at you several times repeatedly and will not boot, something went wrong. You have to open up the PC again and double check that the RAM stick is in correctly. If it is, try switching the first(or first two) and the last (or last two) sticks. Make sure they are paired together if it is RDRAM, as in 1122 or 2211, not 1212. Try again. It should work this time. If it does not, pull out the new stick(s) and try again. If it boots, then you got a dud, which is rare, so get an RMA on it. Read the included return policy for details.
If you got it to Windows the first time, you should notice an immediate improvement. You are now finished with the spring cleaning.
P.S. Remember when I mentioned the Antivirus? If you don't have one, you need to get one. Fortunately, the best things in life are free. go to www.avast.com, put your mouse over the download button near the top left, click Programs, and download Avast! Home Edition Free. Install it, and when it it done, it will ask you to register.
Registering is free, so click that Register link, fill out only the stuff labelled in bold print, read and accept the terms, and click that register button. Go to your email, get that register code (highlight the letters and numbers between the lines in the email that read ----cut [above or below] here-------), hold CTRL and press C [on your keyboard] then let go of CTRL (commonly said as CTRL+C). Right-click the Avast! Icon (blue ball with an a) and click About Avast! second to the bottom on the menu. Click the Register... button on the bottom, and press CTRL+V when the window comes up. The letters and numbers will show up in the box. Click OK, and you are done! Avast! AV is fully automatic and will notify you only if something goes wrong.
Now you are truly done. Congratulate yourself.
Now, all you have to do once a week is right-click Recycle Bin, Run CCleaner, and Start->Programs->Accessories->System Tools->Disk Defragmenter and Defragment, in that order.
Regards, Mike