Me neither. And if you search my posts from 2009, you'll see asking about Win 7, 64bit, and how the programs responded before I bought my desktop with Win 7, 64bit.
When I bought my system, knowing ATX is a resource hog, I bought with future years in mind and got the beefiest system I could afford. 9GB ram (expandable to 16 or more?), the i7 processor, and 750GB hard drive. No fancy bells & whistles, no blu-ray, just a good solid business machine.
My old 2005 vintage XP laptop works fine, but even iTunes in it's current version maxes out the processor. Those of you running systems with low RAM & slower processors might want to use this method when buying your new computer.