I have had a strange thing happen with Windows 7 64 bit Angus. My mission files are stuck on read only which means I can't change them. I can go into mission proerties and remove the check mark but by the time I get back to altering the mission via QMT or Full Mission Builder, they have changed back to read only. Bloody annoying when you try to host.
I am actually thinking of going back to XP..