This is just a heads up for everyone who has upgraded to 64bit hardware. Like many other people, I was wary of the bugs and instability I might have to deal with running XP64 with most 32bit apps. Turns out just the opposite, application and response lag in some areas with 32bit apps was cut in half, and software that is 64bit compliant is very refreshing. Feels like a good portion of what made XP bloatware has been resolved. XSI 5 can already support 4.7 billion polygon scenes on quad x86 based workstations. Microsoft also apparently added a few fixes and touches here and there to make it stand out from the 32bit version. Definitely upgrade if you can afford it, especially if you use XP for graphically intensive work - you probably won't be sorry.