It sounds like you've learned the hard way why you need to back your computer up. I'll give you some things you can do to try to recover, but the first thing you should do is to back up any data you don't want to lose because it sounds like your computer has gotten significantly corrupted and you may have to restore to factory settings or reinstall Windows from scratch.
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.
Internet was down here for a week following a lightning strike which also killed two people.
On eventually turning on the computer I constantly got a demand to use the password for administrator on turning on, (there isn't one) so I decided to turn this password demand off. The next time I turned on, all my bookmarks were gone, last pass had disappeared as well as my addons.
Malware bytes discovered PUM removed, I removed this.
This morning however the computer seems to be slowing.
Sorry about the confused nature of this question, I suspect that I am going on line with the wrong identity?
Windows XP, AVG virus protection.