Thank you very much for all your comments and suggestions. This weekend, I decided to install windows 7 32-bit in a new empty hard drive in my old dell xps 400. Everything went smooth. "windows 7 advisor" was pretty accurate in my case. Everything was compatible, and the only real thing I need was the drivers for my audio soundblaster xtreme card as "windows 7 advisor" warned me. Just in case, I installed the latest release of my intel chipset. That's all. Everything was peachy. Thank you again.