I was able to get CW 6.2 running on a 64-bit windows 7 pro system. There are no 64-bit drivers for the PE micro debugger (I hear that they'll be rady soon), so you'll need to run HIWAVE under XP Mode and forward the USB device to the VM (as the previous post mentioned).
The compiler will run on 64 bit, but the CW intaller doesn't work. I found a work around posted in another thread -- just copy the installation from another machine that has it installed and then run the regservers.bat file in the bin directory (has to be run as Administrator).
You could just run everything in XP mode and not worry about the install issue.