Forget about Xp or Vista. The time is now for Windows 7. You should know that it loads quickly, it loads applications faster than Vista and it is the most secure Microsoft client operating system to date.
Windows XP without any questions. It's the only operating system that I can actually have FULL control over compared to always having to right-click and choose "run as administrator". Windows 7 is literally just like Vista with the exception of a few updates. Yugo,
I have windows 7 installed and ain0t got no big problems.... yet. XP is the best for performance, but i have a good machine running 7, so i see no difference here.
I am an IT professional and most of time I have to test new and updated software's, Testing vista was really pain in head, i would prefer to vote windows 7 because of ease of use like windows xp with extra features
Win 7 is a ultimate OS on my opinion, but still need some enhancement when speaking to features since I expected more.
XP is very good and Windows 7 is also not good as Windows XP. Vista was worst, no one can imagine it's from Microsoft after XP.