My PC which is running 256mb DDR 266 RAM (1 module), Athlon XP 1900+ and MSI K7T266 Pro m'board is locking up. It locked up on XP, so I booted in to 2000, same story, 98, you guessed it.
I then logged in to Linux (RH 9.0) and I have the same problem. It has been getting more frequent, now...