None now. I had the RC7 64bit, worked fine on my home-grown. Tried a clean install on the same HDD after DoD-ing the drive, Black Screen of Death time. Something changed between build 7100 and the "finished" product. I'm on an MS forum trying to get it straighened out; seems to be a GPU problem with codecs or such. But I've got a bad feeling that it's going to be new GPU time. Oh, well, at least there are some new choices so maybe it should be a good feeling after all. After the first of the year Nvidia is on track to release a new ATI 57++ killer according to the blogs, the Christmas rush will be over and pricing should be more attractive for a higher-end card.