Um,..Like I said, MAKE SURE everything you use has 64bit drivers before you install the 64bit program. As for those that say 64bit is a "novelty" and not actually being used yet? I hate to tell them but many people in my area are using 64bit machines and have noticed a definate difference in sound quality in their recordings. I am using a 64bit machine in a rather large studio I work at and we have had no problems (now that MOTU caught up) Vista will be the final nail in the coffin for 32bit, but it will not be "years" before it is released. I have seen vista in action, the program is done, and just waiting for a lull in the sales of XP before microsoft releases it I am sure. Why release the new version when the old version is still selling like hot cakes? Vista has been reviewed bye several computer geek magazines in the past year and a half, it will not be years, it will be months until it's release. MAC has not turned it's back on the G5 the only reason it is releasing 32bit machines right now is because of their recent deal with Intel to start making chipsets for them. MAC is trying to break into the more cost effective computers, which 32bit has become alot cheaper since the introduction of 64bit because everyone knows that 32bit is a dying technology. MAC can now finally get some people into their computers that never could afford to before. I am willing to bet large amounts of money that the G6 (or whatever they call the next MAC) will in fact be 64bit as well and be dual processor. Upgrade whenever you are confident that everything you will need to use will be supported (which should be everything bye now) Vista will be an easy upgrade from XP64 as XP64 and vista are pretty much the same program, vista just has alot of advancments in the visuals and security. Most of all have fun!