I saw that one of your posts had been removed by the Administrator because you mentioned copyrighted material you had downloaded.
So I felt it only right to let you know the reason.
It's not acceptable to mention particular files by name, if you need help about a particular problem, you need to be general in your descriptions, if this includes problem files.
Use terms like 'A large File' or something similar.
Your problem is real and needs to be addressed quickly.
Get an anti-virus prog straight away and run it..
I recommend AVG... go here and make sure you download the free version..
http://www.grisoft.com/us/us_dwnl7.php
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Also.. look at anti-trojans.... this is a free trial
http://www.emsisoft.com/en/
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and.... this is also free....
Spybot...
http://www.safer-networking.org/
If none of this works.. come back and see if the guys can help you any further. You may need to delete stuff in safe mode and I've never done that myself.. but I can find out, if no-one comes back to tell us.
Finally, be very, very careful about downloading stuff, especially .exe files.