This might sound a little weird, but I'm still using Windows Vista Home Basic.
I've modded this OS with so many stuff to suit my work needs and I'd have trouble if I have to migrate all these data and mods to a new OS, so no Windows 7 for me at the moment. This one is still running fast enough for me even on a Core 2 Duo T6400 and 4GB of RAM, you just need to maintain it well.














