What operating systems is everyone using to upgrade their ESC firmware?

I had a smooth and successful update using a Windows XP 32-bit system, and I couldn't be happier with it's performance in Mod. I've read and heard of problems when updating electronics in general on newer Windows 8 64-bit systems ect, not just ESC's but also updating two way radios aswell.

Just curious to know, it might be worth trying this update on an older system if you have one handy.