So this was a laptop, not a PC right? Why else does it have a Mobile Celeron... Definetly stay away from the Celeron, it is a low cost business processor not designed for 3D apps, or intensive graphics work. If you have a choice... for an AMD Athlon. Cost savings might be equivalent to the Celeron, and frankly... the Athlon smokes the P4 for my money. And 256 MB of RAM is barely enough to run WINXP IMHO. 512MB or more is a must best, e.d.