Hi, and welcome to TSF!
It sounds like this could be a malware issue. I suggest you take a look at this thread:
http://www.techsupportforum.com/secu...sting-log.html
Then, head on over to the HJT log analysis forum here:
http://www.techsupportforum.com/secu...this-log-help/
The Security Team will help you there. Give them a couple days, though, they are busy.