Its the Video card. I have put in a ATI Redeon 9600 card and the game is working fine.

I have the lastest drivers for my video card.

It hangs on the first first tutor screen. Alt Tab will free it for a short time. It usuallly hangs on every screen change. Sometimes it will free itself, but after 3 or 4 goes of the Atl Tab key the graphics goes haywire. The No sound option didn't make any diference

Cheers

The Service Pack was a typo it is Service Pack 2 + the lastest updates. At the moment the game is unplayable AS it will crash the PC before the first tutorial finishes.
My PC Specs are:

Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_qfe.070227-2300 ...

When I load GBoR under Windowz XP (Service pack 3) the mouse or the games hangs. I can relieve it temporarly by using the Alt + Tabs keys but it tends to hang again and locks up for good.
Cheers