I've tried installing the Texturen mod on my system (Core2Duo 2gb Ram 4850 512mb) and all the files ended up in the Witcher/Data/Override folder. The result is totally bizarre though, many objects in the gameworld disappear entirely, while others appear as a set of other textures floating about. It looks as if the textures aren't being mapped to the correct items. I'm on the retail original version (UK) patched up to 1.5. OS is Vista (ugh) 32-bit

Anyone know why this might be? Could my cards RAM be insufficient and it's mapping what textures it can fit in?

Your card just isn`t up to snuff when it comes to the texturen mod . You need one with about 1 GB of vram . This mod taxes your card pretty hard .