It is because your IE is infected by malwares.
You have to use other browser now. Or reinstall OS to work on IE again.
FORMAT your USB first and scan for malware or virus attack. Also better if you FULL SCAN your pc too for malwares.
Its a malware attack. Run powerful antivirus and scan for malwares, virus. It may work fine later on.
Of course window 7 64 bit is appreciated. They are also well supported for gaming and high programming languages. Lot many applications can be ran on this platform.
I think you must reinstall window 7 again. Reinstalling may work fine. Good luck
