ok i have a post titled 'sound blaster audigy EAX 5.1 problem...please help!' go there and follow the steps i took...my machine is almost identicle to yours, and although my prob was caused by tv card too close to the sound card in the pci slots, it could be you have yours too close to the graphics card or something!! possible
basically to explain, i was being denied permission to install drivers for my sound blaster audigy 1 EAX 5.1 card. i had to completely uninstal EVERYTHING to do with creative and reinstall after moving the card from one pci slot to another to resolve irq sharing issues, then went to creative driver web page and got all the updates downloaded and installed...problem solved for me!
might be worth you moving the card away from other devices in the pci slots and try that?
let me know it would be interesting to know whether i can actually be of any help for once!!! lol
AMD 2100+ (17 x 133 Mhz = 2.261 Ghz)
Asus A7N8X Nvidia Nforce 2
MSI Geforce FX 5600 256 DDR GPU
Creative Sound Blaster Audigy EAX 5.1
1.00 Gb PC2100 Ram (Dual DDR Timing Enabled (System performance = 'aggressive' in bios))
Maxtor 60 Gb HDD 7200 Rpm
LG DVD / CD Rom
Sony DVD R/W