LOL Preposterous! You're already infected with the malware when you started downloading from here (you admitted that in your comment). How can an anti-virus detect something is wrong *while* you are downloading it?

You're probably trolling but just in case...

* Read about WinFixer on wikipedia. It will explain to you how someone can get infected with it.

* Download a trial version of Kaspersky. I highly recommend it. Update the definitions and do a full system scan.