I am using XP and I have no problem with that.XP is best for me.I have tried vista but vista having lots of problem so again I have shifted to XP.
I used Vista when it first came out and I uninstalled it after a day. Then in July I bought 64 bit Vista and gave it another try. I've gotta say it's awesome! It's perfect for business.
still using and will always using XP just because my computer hardware not good enough for vista yet.