I have bought Jedi Knight II: Jedi Outcast for a friend of mine and was wondering, before he opened it, if will work in his machine.

Here are his specs:

Windows ME
Intel Celeron
Enough mHz, like 900
128 MB RAM

Also, was wondering if there have been any problems running on machines like the one I have.

Here are my specs:

Windows XP Home
Intel Pentium 4
1.6 gHz
40 GB HD
256 MB DDRRAM

It will work. I have an Intel Celeron 1 gig using a Radeon 8500 64 MB, and it works great. It should work fine on your machine too, but make sure you've updated all your drivers for Windows XP (you probably know that already, but just in case, hehe).