Go to Start, Programs, Accessories, System Tools, and Disk Cleanup. Disk Cleanup will analyze your hard drive of any junk files. If Disk Cleanup find anything, click OK, then click Yes to remove those files.
Next, go to Start, Run, and type in temp and %Temp%. Delete those unnecessary temp files in both of those folders.
Go back to Start, Run, and type in cookies. Delete all those cookies.
Double click on My Computer icon. Right click on your local disk drive
and click Properties, click Tool tab, then click "Check Now..." Make sure "Automatically fix file system errors" and Scan for and attempt
recovery of bad sectors" are checked, click Start, and you get a pop up stating Windows can't run this utilty because it needs some files. Click Yes and reboot your machine. It will go through five stages to file system file errors to recovering any bad sectors which slow down your machine's performance at boot time.
Defragment your hard drive. As you download, remove, add, and move files, your drive will become fragmented. To defrag your hard drive, go to Start, Programs, Accessories, System Tools then click on Disk Defragmenter. Click Analyze. If it says you don't need to defragment this volume, go ahead and click Defragment. If it says you need to defragment this volume, click Defragment. Make sure not to have no programs running or opening. Exit out of Disk Defragmenter and resume
using your computer.
Go to Start, Run, and type in Msconfig. Then click the Startup tab. Uncheck those startup items you don't want starting up at boot time. Leave your anti virus, firewall, or all in one security applications alone and checked. If you don't know what to remove, google it. Click OK, apply, and reboot your machine.
Scan for viruses, malware, trojans, ad-aware, spyware, etc. These types of nasties are known to cause computer problems. Scan using an up to date anti virus software. If you don't have one, download, install, and register Avast from http://www.avast.com. It's a free anti virus program. For malware, adaware, spyware, etc., try SuperAntiSpyware from www.superantispyware.com, Spybot Search and Destroy from http://www.safer-networking.org/en/mirrors/index.html, and Ad-Aware 2008 from http://www.download.com/Ad-Aware-2008/3000-8022_4-10045910.html. Download, install, and update the definitions in all three programs, scan for nasties, and these should get rid of the spyware, malware and ad-aware problems for you. After you are done
using these applications, you are welcome to uninstall SuperAntiSpyware, Spybot Search and Destroy, and Ad-aware if you want to. Do NOT uninstall Avast.
Go to Start, Control Panel, and click User Accounts. Click on "Change the way users log on or off". Uncheck "User Fast User Switching" then click Apply Options.
Upgrade your RAM to 1GB if you are on Windows XP or 2GB for you are on
Vista. A slow shut down can be relative to the lack of physical RAM.
Registry defragmenters and cleaners doesn't work for me or my PC or
laptop. I didn't notice a noticable speed difference at all on both. The best defense is reinstalling Windows XP or Vista once a year. To
get it like the day you bought the PC or laptop home.
These things might or might help you. But it ceretainly helps speed up
my computer.