BDI-EMC configuration

Does anyone know how to reconfigure video cards in Linux EMC (RedHat 6.2
OR 7.2) AFTER the full install is completed?

I have a VIA Chipset with CastleRock Video. The drivers wont install
properly since the Kernel is 'RTAI'.
Also put same install on diff. HD on my laptop and still getting same issue.

I've been trying a few of the Generic settings but have to do the full
install each time to impliment the setting.

The new 2 CD disk set with RedHat 7.2 looks promising, if I could just get
the video drivers correct....

Any info would be appreciated.

Vince