|genogeno, I sorta agree with Steve, almost. I too suspect malware, but I'd hold reinstallation as an absolute last resort after everything else fails. Possible you've got some sort of nasty (virus, worm/trojan, etc.?). Be aware that a virus and a Trojan are similar, but not the same. Many times, an AV detects one it can't clean, other times, it gets missed entirely.|
If you need to clean one, Superantispyware (info only. I’m not paid for recommendation. WARNING! FYI, a full scan on mine takes over an hour.) can do the job and you can get it free @:
among other places. They have a Vista compatible version if needed. Dunno about Windows 7 or later.
If it turns out that you need to use it, be sure to update Superantispyware prior to running. Disable 'restore' after cleaning and run it again (to remove any nasties living there, restart after cleaning) so the nasty doesn't get put back should you later ‘restore’. They just released a new update recently and it changes all the time. Things are in a constant state of flux.
The restore thing is critical. May not be your deal at all, but won't hurt anything to try.
Ed in Texas