There seems to be corruption on the harddisk in the form of either viruses or spyware (and from the sounds of it, quite a bit).
The best solution here would be to restore the PC back to factory defaults if you have the disks, otherwise obtain an OEM copy of Windows which you can legally reinstall using the license key which is stuck onto the machines by the factory.
Hi chungYu,
after reinstalling and upgrading if we scan pc, it would work ,after restoring to factory settings you will lose data.
If you were able to get a scan started, you would be able to clear out some of the viruses.
You can boot the computer into safemode -
1.You should print these instructions before continuing. They will not be available after you shut your computer down in step 2.
2.Click Start and then click Shut Down.
3.In the drop-down list of the Shut Down Windows dialog box, click Restart, and then click OK.
4.As your computer restarts but before Windows launches, press F8.
On a computer that is configured for booting to multiple operating systems, you can press F8 when the boot menu appears.
5.Use the arrow keys to highlight the appropriate safe mode option, and then press ENTER.
6.If you have a dual-boot or multiple-boot system, choose the installation that you need to access using the arrow keys, and then press ENTER.
Once inside safemode, you can run the virus scanner and remove any unwanted malware.
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The issue you are describing sounds like a software corruption issue (possibly due to the anti-virus software recently removing something it shouldn't.) If at all possible, you might consider attempting a System Restore (if it will let you) or see if you can do anything in Safe Mode (by hitting F5 during the boot process and selecting "Safe Mode" from the menu.) Chances are good that the operating system will need to be reloaded in the near future to completely resolve the issue, however
The best solution would be to do a "system restore".
Go to "Start/Windows menu --> Programs --> Accessories --> System Tools
Select a saving point in which you think your PC was working fine.
Reintall with administrator a/c update it and scan whole pc.
It is very possible that you have a virus infection. I recommend visiting this site and downloading the virus scanner from ESET. This software will be able to clean up your computer for you. I would also recommend removing Norton from your computer by going to the Start Menu > All Programs > then find Norton and click uninstall under that folder. You can purchase ESET on their website for $40 a year and it will offer you much greater protection.
http://www.eset.com/download/free-antivirus-utilities
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