What would you install on a HP computer running a K6-2 550MHz and 256MB SDRAM? XP tends to run slower on older computers but the XP bootup is much faster than 2000. Compatibility wise I think both work well for your average user. XP is the more popular OS so I might be leaning towards that. I can put XP on performance mode to speed things up but overall which one would be the better one.