It sounds like you could have a virus or other malware. Get your antivirus program up to date and boot into Safe Mode. Note that some viruses can hide themselves from your antivirus program in normal mode, so you really need to scan in Safe Mode. To get into Safe Mode when you first power up, hit F8 about once a second until you get the menu and select Safe Mode. Then run a full system scan.
Microsoft has suggestions and offerings at
MS forum moderator Keith has some suggestions along this line at
If that fixes it, fine. If not, use System Restore to go back to a date prior to the beginning of the problem. To run System Restore, click Start -> Programs -> Accessories -> System Tools -> System Restore. Click the box that says Show more restore points.
You can check for corrupted system files. Open an administrator command prompt and run SFC if the above doesn't help. Click START, then type CMD in the search box, right-click CMD.EXE and click Run as administrator. Then from the command prompt type sfc /scannow.
Finally if all else fails, you can check the rather cryptic system event log. To do that click Start -> Control Panel -> Administrative Tools -> Event Viewer. Once in Event Viewer click on the system log and scroll through the entries looking for those flagged "error" to see if you can find hints as to where the problem could be.
When you get your system back in good working order, I urge you to back your system up to an external hard drive and make regular periodic updates to it.
I hope this helps. Good luck.
I have a Lenovo desktop we bought maybe 18 months ago, with Windows 7 / 32-bit. The main user is my wife, and my kids use it occasionally too. We have some photos, a lot of E-Mails, some documents, but nothing in my mind that should be clogging the entire system. For the most part the computer ran just okay since the day we bought it - not super slow but never particularly fast (we have a cable connection). But suddenly a few days ago it just started running extremely slow for no apparent reason. It's slow on all applications, and a couple times when I restarted, it froze up on a black screen and didn't load up Windows. I've noticed the hard drive seems to be constantly working, on what I don't know. Possibly something is running in the background or somebody did something, but I'm at a total loss on what to do.
I'm sure I need to provide more information but I'm not sure what. If someone is looking to provide an answer but needs more info, please let me know and I will provide it. Thanks in advance for anyone who can help out. I'm hoping it's an easy solution.