This problem can occur because of Spyware , go on over to the Security section of this fourm and post you problem along with a hijackthis log .
Spyware & Trojans and Other Nasties
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Please Don't post the hijackthis log in this section Thanks .
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Please do this.
Download 'Hijack This!'.
HijackThis
Save it in a convenient
permanent folder such as C:\HJT\, double click HijackThis.exe, and hit "Scan".
Your copy of HijackThis needs to be in a folder of it's own. When HJT fixes anything, it makes backups of the original files in the folder it is in. Since Temporary folders are emptied now and then (the files are DELETED), it
would not be a good idea to have your backups there. Those backups would be VITAL to restoring your system if something went wrong in the FIX process!
1. Please go to you're 'My Documents' folder, right-click and select 'New > Folder' then name the folder 'HJT'.
2. Copy and paste HijackThis.exe to the new folder.
3. Close ALL windows except HJT
4. SCAN with HJT
5. POST the new log in this thread using 'Add Reply'
DO NOT MAKE ANY CHANGES OR CLICK "FIX CHECKED" UNTIL WE CHECK THE LOG, AS SOME OF THE FILES ARE LEGIT AND VITAL TO YOUR COMPUTER'S HEALTH 
Unsolved 
