windows 2003

I'm looking to reformat my laptop and I need to decide between windows 2003 server, windows XP and windows 2000.  The laptop is a bit older and I want the best performance I can get from one of these three operating systems.  Thanks for your help and opinions 4chan.

>>36
Because after months of use I finally decided to install AVG and Ad-Aware just for shits. Installed, updated, and did complete system scans with both. Nothing, just some cookies in Ad-Aware.
Now I just let AVG sit in the background, and I manually scan things when I download.
I should also note my mom's computer has been running Windows 2000 for about a year, also with no virus protection or anything. Just firefox. And hers is running fine, too

>>37
Not really