I would skip vista all together. That OS dont fullt support alot of games. I got vista, i just havent installed it. Also you might wanna try OMEGA drivers. They Might fix your vista problem. Im not sure though. Read their driver release notes.
well i just got a new pc and i kept getting nagged to try it out and i dont like formatting, so i dont wanna format again just for 1 game having issues... even though its an awesome game ill just hope they release a patch that addresses this, and hopefully it wont take 2-3 months
I ahve run Vista since January, with no problems from old applications. i have run The Witcher since October without a single crash, until Patch 1.2 anyway. So, all this talk of Vista problems really perplexes me.
My system is no slouch, runs Crysis on all High settings other than shadows and volumetric and with nice smooth buttery frame rates. This (The Witcher) gets a bit touchy only with a few areas in game for me and grass in that area can be a nice frame rate slower on high. I sometimes turn grass off like in the fields because there is too much to see clearly and for me it's not a big deal to lower, might help you like others suggested. Hope it works better for ya!