Here's how to get Google Gears working on Windows 2000: SEE BELOW
It involves using a set of XP API wrapper DLLs that intercept the XP-specific calls and translate them to Win2K-compatible calls. It works like a champ, and I use Google Gears on all my Wordpress sites I administer.
The direct source is here: SEE BELOW
Here is the actual download tool that makes Google Chrome work on Windows 2000: SEE BELOW
Since I'm new to SuperUser, I can't post the direct links. So I posted all 3 on Pastebin for easy access: http://pastebin.com/f1f1031ff