This is not normal windows behviour. What antivirus and antimalware software have you got and have you done full scans with them recently? Did they find anything? If so, what?
Rik from RCE
Nearly a Posting Maven
2,335 posts since May 2009
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Solved Threads: 199
Nod32 is antivirus, what antimalware software do you use?
Rik from RCE
Nearly a Posting Maven
2,335 posts since May 2009
Reputation Points: 127
Solved Threads: 199
Bit Defender is also antivirus and not antimalware.
You should only ever use 1 antivirus program as they can clash with one another.
Download Mbam - http://www.malwarebytes.org/mbam.php update it, and do a FULL scan. Post it's resulting log here.
Rik from RCE
Nearly a Posting Maven
2,335 posts since May 2009
Reputation Points: 127
Solved Threads: 199