which one is the best!!!!

I highly advise you to install windows xp onto your pc. It is a very successful product from Microsoft. We seldome hear any negative comments about it from other users. It has a friendly interface and easy to control even for novices. I think windows vista is not suitable for most of us as it covers too much harddisk space and has lots of compatiblity problems with pc hardwares. It has been considered to be a transitional product. Any beta version has more or less problems concerning softwares and hardwares. It's not a good choice to install any beta versions unless you only plan to test it.

With that specification I would highly recommend to go to Windows 7 I tested a few weeks ago and really works well and very snappy when you open programs.Right it is till running best no problem at all.Though Windows XP are very mature but Microsoft is already planning to phase out that version and support are limited in the long run. Windows Vista don't about it installing on your PC it really sucks.

If you want a high end performance, you have to chose windows XP. If you give importance to the appearance and desktop effects, then it's better to chose windows vista. But, as everybody knows, vista is resource hungry and therefore system requirements are very high. It cannot give performance up to the expected level.