Did you clock back to standard speeds?
My Omega's 4.4s (but now 4.6's) did exactly what you showed, the crazy lines and colours when I upgraded them. I left my card overclocked 400/372
iirc and I upgraded the drivers, everything went fine and then when windows booted in, it was all crazy and looked just like that or your pic, but a bit worse. How I got around it was clocking it back using RadLink (which I used to O/c in the first place) and restarted and everything was fine.
I think the new drivers should sort stuff for you so best to give that a bash and make sure your card isnt overclocked.
Hope this helps
