The game is not officially supported under win2000.
Most people seem to get it going, but have a problem in towns. But by uncompressing certain files you can get by that.
I hadn't heard of your problem yet, but it sounds like it is something of a bug that doesn't happen on win95/98, so wasn't discovered while testing. Perhaps someone else has an easy solution for you, but to me it seems like a serious problem for you.
Anyway, the first thing you should do is get the patch; perhaps it fixes the problem.
And you should try reporting the error; I've heard rumors that they are working on a new patch, so perhaps they can fix it.
There are a number of problems with nVidia cards with the newest drivers (detonator 3); my system with a TNT2 kept freezing randomly with them. You could try to find some older drivers to check if that helps.
Otherwise I guess you could try not to cast the problem spells: no spell is vital to completing the game, and only a minority is problematic to do without.
Good luck.
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