I switched from XP to win 7 64 bit about 2 months back. It was very easy since win7 already includes basic drivers for most devices out there. As others have mentioned, it was very painless, certainly easier than when I periodically had to re-instal XP. I was up and running within a few hours.
I have not had any issues. There are 64 bit drivers for most devices and where there is not, like track IR, 32 bit works as well. I did not use the included file transfer program since I had transferred all my essential files to an external HD beforehand.
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