I had this same situation recently myself, every time I opened up explorer an advert would load instantly telling me to download their program.
I tried multiple adware programs as well as virus scanners, they wouldn't pick up diddly squat so in the end I backed up 8 DVD's worth of data and reformatted my hard drive.
No problems now after formating and reinstalling.
Hope you get your problem sorted nikimcbee.
Steve
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