It runs on W7 (I have used it on a W7 SP1 64 bits with no issues). You may need to refresh the earlier directX versions, see the "earlier versions of directX" paragraph : http://support.microsoft.com/kb/179113
Another question concerning the "Original Version" - can you play "Multi-Player" with people who have the BG2:EE version??
Bg2:ee is quite a bit different engine-wise, more polished and advanced when compared to the original. I assume, logically, original bg2 can not multiplayer with someone who is on bg2:ee, the game engines and such are way too different.
Comments
You may need to refresh the earlier directX versions, see the "earlier versions of directX" paragraph : http://support.microsoft.com/kb/179113