Min Config for reasonable performance :
128 MB RAM
Pentium 3 , 1 Ghz or better
32 Mb on board graphics
Recommended config for XP
256/512 Mb Ram
Dual Core processor > 1.5 Ghz (Actually by itself Xp runs well on P4 3 Ghz processor, but if you install current generation of programs, its sure to slow down)
As for laptop config, I think the processor is P3, so it should give just the minimal resonable performace.
The good in Upgrading to Xp is that
- its far more stable than 2k.
- all current generation programs are supported.
- Its still updated by M$
Don't expect any increase in speed, however. Any newly installed OS is bound to be fast untill you install additional programs.