Both XP SP3 and Vista SP1 are rock solid for install, they had a couple bugs when they first came out but have been solid ever since.
after the SP's are out for a month they are pretty solid after that point, and those have been finished for over 6 months now, so yea.
after the SP's are out for a month they are pretty solid after that point, and those have been finished for over 6 months now, so yea.