I have a windows vistas computer and i was downloading a online game when it asked me what to open it with. i selected winrar from the list but right after i did this all my icons changed into winrars and i cant run them because it says its changed or damaged. I cant run anything which inludes internet (im lucky i used steam to acces it), firefox, task manager, system restore and a bunch of other stuff. Please help me im feeling really sick right now because this is a brand new computer and its like $600 
