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my wife loves to watch movies on the internet (free). When ever she goes to those website, next thing the PC will get full of spyware and adware. I will have over 100 I.E windows open trying to sell me some thing.
IMHO I'm afraid that it is time for a cold install or the purchase of a new PC. The PC clearly has a viral "root kit" which is by-passing the virus scanners. DO NOT use this PC for Internet Banking or Email under any circumstances. IMHO it is compromised beyond repair (except a cold install).
After you have spent the time and money rebuilding your computer or buying a new one, compare the cost with renting videos or going to a legitimate "free" movie download site (if such a site actually exists?).
I would expect "on demand" movie downloads to be chargeable as distinct from say BBC IPlayer where you can download a recently broadcast movie providing that you have a TV licence.