Re: Looks like my GTX260 needs to be RMA =(
nvlddmkm is mostly caused by software issue or hardware instability that is not always directly caused by the video card.
vista requires much more stable system then XP, system that was stable in XP will not always be stable in Vista.
nvlddmkm mostly mean that one component of the sytem is not stable. good test would be to drop everything to stock speed. if your card is factory overlock also lower it to stock.
Windows 8 the next big failure, right after Windows ME