Oh my word, each heading could spawn a lengthy reply!
You'll just have to Google for this one, I think.
I remember IL2 Sturmovik from years past, but always preferred
MS Combat FS 1 , 2 & 3 (particularly 2 for its ease of modding).
(They still run great under XP).
Are you running Sturmovik OK; I found the default settings OK,
but it's a long time since I ran it on an older computer, Win 98, I think.
Still gaming at '94' -