I run P5 SR1 on a 1.3Ghz PC with 128Mb RAM, 40Gb HD with just 1Gb free space on WinME. So far I only have trouble with the obvious lack of memory (as to be expected, not a P5 bug!) and a few (dismissable) userinterface oddities. P5 works great for me (so far...). Im sorry for those people that dont seem to get P5 in working order, however, did you consider the fact that your OS might be the troublemaker? Both XP and 2000 are know to have 100s of bugs...