Sf4 pc problem.

Well im getting extremely bad screen tearing and def do not want to turn vsync on :/ If I run sf4 in compatibility mode for any other windows (im on 8) there is no screen tearing at all. First of all, why in the world??

Secondly, thats great but in compatibility mode my stick wont work :(

Any ideas as to

1. Why compatibility mode gets rid of the awful tearing?
2. Why my stick wont work when using said mode?

Thanks alot for any help, im going insane over this