Hey Guy's
In order to run the tech demo you must have: any version of Windows Vista with all the latest updates, A Direct X 10 Card which currently is only the NVIDIA Geforce 8 series video cards and with the latest video drivers installed Forcewares version 158.24 and Direct X June 5th 2007 version 9.19.1005. And your PC must meet all hardware requirements for X10 like Ram and CPU speed.
If you have all the above you should not have any problems running the tech demo, I have no problems running it,
Just so you know my PC specs are:
Windows Vista Home Premium
EVGA Geforce 8800 GTS 320 MB version
Mother Board, MSI K9N Neo Socket AM2, Nforce 550 chipset
AMD 64 5200+ X2 CPU
4 Gigs DDR 2 PC 800 ADATA Brand(running Dual Channel)
2Qty HD’s 1 500 Gig Samsung SATA 2 Hard Drive and 1 250 Gig Western Digital SATA 2
Liteon 16X DVD Burner with lightscribe.
Latest Direct X download
http://www.microsoft.com/downloads/details.aspx?familyid=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en