@Daze : does this happen straight away when you run it? Very odd. Have you unzipped all the data into the right subfolders? There should be 6 or more subfolders and only about 3 or 4 files in the SCR_Demo root (the tokamak DLLs and the EXE).
I get a black screen briefly (full screen) and then it drops back to the desktop with the MAV error. All files and folders have extracted from the ZIP successfully.
FYI: Windows XP SP2, 3.2Ghz P4, 1Gb Ram, ATI Radeon 9800 Pro (128Mb), Audigy 2