Hi for what it is worth ...
I am using a MacBook Pro with 8G ram, and due to some of the applications I have to run for work, I run Parallels and Windows 7 64 bit
I find the Windows platform VERY stable. I went for Parallels, as I want to run Windows inside my Mac environment, and bit not want to dual boot i.e. have to shut down programs to switch from one to the other.
All the updates work very well, all the applications I run in the Windows environment are stable, and cause me no problems at all.
Everything on the MAC runs well, with no effect on the processes. When I plug anything into the USB ports, I am then given the option if I want teh device to run in the Mac environment or the Windows,
Hope that helps