When I got shit like that, I usually do the following in that order (I'll stop once the problem has been sorted, if the antivirus has done the trick, no need to do the following): 
1- Run antivirus, antispyware and antimalware 
2- System restore at a point back in time (you might have to go quite far as you may have had the shit dormant on your computer for some time) 
3- Format 
Hope you get that sorted and are back among us soon. 
 
Nagash/Petitpas 
		
		
		
		
		
		
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