Yes, IceFire, that just sounds like it.
The typical nvlddmkm error:
"Driver has stopped responding but has been restarted"
If you just upgraded your RAM, you may be lucky and return it and get some other you won't have problems with. If you made another change, try to reverse that. If it just came out of the blue, it's not easy to fix. Apparently it's a memory-addressing bug that is in Vista (and of course in Win7, too).
Usually it won't be a problem, as error-correction can make up for it, but if you use overclocked hardware, have power-problems or driver conflicts, the error might occur more often. I noticed that with 64bit Vista/win7 this problem occurs a lot more often, if you use more than 4 GB of RAM. But though the nvlddmkm-file is an nVidia file, the same problem occurs with ATI, too.
You can try to lower frequencies or get them more tuned to each other, but there is no easy fix for this.
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