The odds of finding someone running this software with your exact motherboard/graphics device are probably rather long, so I'll venture a tip or two, even though I don't use this software..
* Avid Express offers a trial (15day) version, so you can test without risking any money.
* The worst that would likely happen is that the NLE won't be able to keep up smoothly on it's editing monitor.
If you decide to change your motherboard, places like NewEgg, TigerDirect, etc. offer motherboards at reasonable prices - just be sure your cpu will work with it - or, better yet, upgrade your cpu and motherboard by choosing a combo option from one of these vendors or - better still - from a local computer shop.