k994,
You've claimed (in order)
1)You updated your video drivers
2)Its a 7800, so its not too old a card
3)You don't understand how to update your video drivers
4)Your video card came from your mothers 2004 Dell
5)That you updated the drivers (for real this time

) and it works
6)It doesn't work
How can you hope for accurate help when you obviously lieing to us?
Since I am disinclined to believe you are using a 7800, and I told you the same thing yesterday, listen to Zaphod (who really knows about such things!).
Edit:Window title "update drivers" Go Go gadget verbose error messages.