video card change only with OS reinstal?

Hi there
I am planning to change my current video card (Gigabyte x1600xt) with an XFX 8800 gts 320 MB in a few days, but I'd rather not perform a clean XP instal before doing so...I have received advice that the best way to be sure that a new video card would work properly is an OS reinstal, especially if its about a complete GPU change, form ATI to nVidia. I have used DriverCleaner pro in the past but only to replace standard with optimised drivers for my x1600xt.
Can I dispose of the old ATI drivers with DCpro, then mount the XFX 8800 and instal its drivers or do I really have to do a reinstal, too :?:

Should it help in any way, the rest of my system comprises an E6400 on a GA-P965-DS3, 2 GB DDR2 GEIL ultra 800 mhz CL4, Seagate Barracuda 250 gb SATA2 7200.10 (OS) + Seagate Barracuda 160 gb SATA2 7200.9

Seconded- Dont know who told you that but they must have had a way big prob if they had to do it ,just make sore you get rid of all traces of drivers as assman has said and away you go!

good luck 8)