I used to use FreeBSD and switched later to Mac OS X (never really liked it though), which made me quite lazy. After my macbook pro gronked out, I switched back to Windows out of convenience. Besides I wanted to play some games again and had a few applications that would have required emulation, so I swallowed the (once) bitter pill and installed Windows again and I have yet to regret it. Been using Windows 7 x64 from the beginning (MSDNA) and I haven't had any problems. So, this is me, using windows 7.