Hehe Win XP 64 had problems just with itself. My dad tried that for a bit, but gave up because there was such a lack of driver support that he couldn't get it running to the same level as his 32-bit XP install.
Oh, if you are doing web work, you may want to check out Coda. It is a good looking WebCode IDE that gives you just about every web design protocol that I have ever heard of. HTML, Java, Ruby, PHP... you name it. It appears to be similiar to functionality to Dreamweaver, but a little bit smoother in operation, and much cheaper.