MSI KT4 Ultra.....how to activate 8x agp?

i know theres an option to set the agp speed in my bios but for some reason its set to auto and it's "greyed out" or rather blued out and i cant change it. i got a 9600xt today and in the ati options its set for 4x atm and when i set it for 8x it resets back to 4x. can anybody help?

*edit* after getting the newest cat drivers i also got the updated via 5-in-1's (add support for the agp 8x) which caused my system to continuously reboot. so i reverted windows back to before i installed that and now in my ati properties it says agp is set to 0. weird.

okay tried both the 4.91 via drivers from the MSI site and the 5.1 drivers from guru 3d and both cause my system to continuously reboot (never even getting to windows). i never had this problem with the old gforce 3ti.