I'm running Win98SE on a P200MMX right now, with 98SE2ME. It's pretty rock solid. I've never liked ME, it was sluggish and buggy on my parent's first computer, and that was a 1.4GHz P4 with 256MB RDRAM. I especially wouldn't run ME on a P5 machine with the 64MB RAM cache limit (Any Intel Triton chipset other than the HX), while you can put more than 64MB of memory in one of these, it slows the entire machine down. Of course, with 64MB there's more paging (even more with ME), but system performance when not paging is much better. I would only put ME on a machine that doesn't have the 64MB RAM cache limit. Not personally, but you're going to have a lot of time to beat your head on your desk while things load and crash. This is more important than clock speed in my opinion. If you want stability just put NT5 (2000) on it. Would probably run better than ME. Edit: You don't need a patch or BIOS update to use large HDDs, just get a cheap UltraATA66/100/133 PCI card. Problem solved, and you get a faster interface as well.