|Try to be more specific as master posted above, it could be more than just a simply virus it could be malware,spyware,adware,trojans,rootkit which is the worst of all, it can take up to doing 5 to 6 scans with many different programs to fix your problem,run hijackthis to start with but dont do anything with it just save your log for now|
google hijackthis and download,install then scan then save the log file which it should do automatically. also download atf file cleaner
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