I've got Area 51 installed and have started to play it but the weirdest thing is i can only jump at certain times! i've got the real version wont jump got a cracked wont jump got it for ps2 works and i can jump all the time but it wont jump on my pc! Ive installed and uninstalled tried compatibility mode but it wont work it says cant run in compatibility. can any1 relate or help?