Run msconfig. Go to the services tab, and exclude Microsoft services. Then Google each service that is left. Shouldn't be a lot of them. For your video drivers, use DDU to uninstall all scraps. Then let Windows find and install video drivers. If you've switched brands of video cards without a full uninstall/reinstall it will often times cause problems.
You should never let Windows install your GPU drivers. It will always install a much older version. I agree with using DDU to do a clean uninstall though.