Hmm, that's really strange -- thanks for the added info, though. I'll be interested to hear what happens with the CNET version, hopefully that one will work fine. I don't think the dxdiag would help in this case, just because it doesn't include installation-related info on it (but thanks for the offer). I've been talking with the Advanced Installer folks about this, and hopefully when I officially release 1.006 tomorrow, that issue will be resolved. In the meantime, I imagine that the CNET version will at least be installable. Let me know if that doesn't work!