Well, I Installed my trusty copy of Jedi Knight Academy, when this error popped up in the script box, not letting me open the game.

--- ambient sound initialization ---
Sound memory manager started
Loading dll file ui.
Failed to load dll, looking for qvm.
Loading vm file vm/ui.qvm.
Failed.
Shutting down OpenGL subsystem
VM_Create on UI failed

I've updated my audio and video drivers, but that diddn't seem to helpat all. I am somewhat technologically inept, so i humbly beseech any of you to help be with this error.

P.S. Singleplayer works fine, but what i really want is Multiplayer, and when i try to open Multiplayer is when that error occurs.

This may be a 'bug' that needs patching but have you tried right-clicking on the launch exe then properties. Along the top choose 'Compatability' and then 'Run this program in compatability mode for Windows XP SP2'. I also 'Googled' your problem and found this page here:
LucasArts Technical Support Forums
Basically the poster had the same problem or one very similar and LucasArts posted back with links to updates and possible solutions (with a link to a patch), you'll have to read thru to find tho'
Good luck and I hope this helps

__________________
AMD X2 6400+ 3.2GHz BLACK EDITION::SCYTHE SAMURAI COOLER::GA-M51 M/B::3GB DDR2 6400RAM::GEFORCE 8800GTS320/625/900MHz DRIVER '174.74' BETA::160 RAID 0 SATA2::SOUND BLASTER AUDIGY/'DANIELS' DRIVERS::LITE-ON DVD RW/PIONEER DVD::HIPER 530W MODULAR::THERMALTAKE ARMOUR Jr CASE::RAZER COPPERHEAD MOUSE::VISTA HOME PREMIUM SP1