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Allright first you need to uninstall the quicktime you have installed, and reinstall quicktime prefferably from a site you know is legit. If you have problems after that, there is a possibility you got a virus, in which case you need to visit our tutorials and pick up a good virus scan. Good luck.
Providing everything was working properly on your computer before you downloaded Quicktime the quickest way to fix the problem may be to use Windows System Restore to revert your system state to a point before the problem began.