enough :)
want no issues with dcs a-10 ? go for a 64bit os.
xp or win7
For me win7 has some nice troubleshooting fixes and win7 fixes minor issues by one click. And plug and play is now alot better.
Haven't had a single blue screen or any serious hangs in win 7 (touch wood).
drawback is that win 7 has alot of features turned on that is not needed for a gaming pc. Those are pretty easy for get rid of via some google'ing :)
Also from a multiplayer standpoint...I would have a hard time justifying a long mission with a player on a 32bit system, due to the high risk of the player crashing.
Also with a 32bit system, you will not get full feature of the game, it is simply just not supported.
So lets move on please ;)