Always glad to see poeple who love Flight sims-)
2000 had bad 3d code...2002 has good 3d code...,but
FS 2002 does take more resources to run than FS 2000 did. The graphics are really quite amazing, best i've seen in a flight sim yet. You can turn down the options a whole lot but if you cant get 2000 to run smoothly then i'd bet 2002 wont either. The code is alot better written in 2002 but like i said, its alot more advanced and resource hungry too.
My suggestion for getting it to run smoothly is to upgrade that graphics card with a GF4 440MX. They run around 120 dollars online.