You may want to look at the following site:
http://www.nikoncafe.com/vforums/showthread.php?t=176373Look at the second item in the forum on how to tune your computer for NX2. It seems to have helped a lot of people. It involves being sure of the .Net installation and the Visual C++ installation. If you always update the service packs, etc.. most of this stuff should be up to date. You might want to try what they suggest. I have all the updated files installed (.Net and C++) with service packs and I have an old (5 yr) computer. 1.5 ghz, 1.5g ram and NX 2 runs fairly well. I don't do a lot of batching or heavy (D lighting) processing and the speed is OK. Hope this helps
Mike