Pc wizards enter here to help me with registry

[ryan37]

i recently installed Medal of honor : AA, but it kept crashing, so i un-installed it. now i have some ways to fix it so i want to reinstall, but it wont let me, it acts as if it were still installed. i have used the fixed exe/no-cd from here, so i dont know if that has anything to do with it, but anyways, all i want to know is how to rid my pc of the registry to install the game again.