Zoron :
You've been woefully misinformed...
With that laptop, Vista will run just fine... you won't notice a lot of difference between it and XP. I would recommend 64-bit Vista, since you have 4GB of RAM.
I'm not sure where the previous poster got his information, but Vista's support cycle is certainly not going to end before XP's.
**Sigh, I really wish people giving "advice" on this forum would check the information they are providing.
http://support.microsoft.com/lifecycle/?p1=11712
http://support.microsoft.com/lifecycle/?p1=3221
XP will be supported for 2 years longer than vista.
http://www.tomshardware.com/reviews/xp-vs-vista,1531.html
http://www.zdnet.com/blog/hardware/vista-sp1-vs-xp-sp2-benchmarked/1332?pg=4
XP is faster than vista and uses less resources.
Now apologise to this person for providing them with bad information.