You might try a system restore, It sounds like you are badly in need of a clean install of Windows and you really need to learn to never install 3rd party applications that fix things (it is very similar to investing your retirement in a Vegas slot machine).
If you want to try a system restore I highly recommend booting from a Windows install disk to do it or if you don't have one create a different admin account other than your normal one from witch to run it (system restore occasionally hoses up the user account you run it from)
If all works well (and you have good restore points in the right date range) you can jump back in time to that happy place before you installed the app.
Thanks
Mike