Windows X\P will run fine with the "AMD Athlon (tm) 1.0Ghz, 256 RAM and 40GB H/drive."
What you have to take in to consideration is your peripherals and software. You may have to go the web to get drivers for some.
As to if it is worth it. It's horses for courses. Some say M.E. is great, most say X\P is brill. I personally think X\P is far above the best O\S to date.