installing SP2 without good reason is a BIG no-no in my book. I've made thousands$$$ fixing systems after folks were done doing this!
(amazing they would release something so likely to mess up so many computers!)
you say the system sees it? exclamation point? any error message? how is it not working?
hard to diagnose these things here. it can certainly be fixed and it is 99% likely to be a driver issue.