Cant open CF

Whenever i open CF,a thing comes up and it said client corruption detected,closing client.what do i need to do?maybe a virus that corrupted the file cuz its ok yesterday when i play it.im using malwarebytes.

Edit:after reading the thread that [GM]Saidin made,reinstall,scan for virus that toke me 2 hours,and rebooting my computer.i was able to get cf work again,so sry for making this thread.