When installing, do it with AV turned off.
Install the game then install patch 534_b .. then install the directory server fix.
that is it.
After that, you can install whichever mod you like.
to play the game, find the SFC3.exe file, right click it, select properties and put checks into Disable Visual Themes and Disable Desktop Composition.
the game should work fine.. also if you Crash on your first launch, go into the SFC 3 game folder to Assets\Scripts and find the Cache files (*.cache) and delete them, the game will generate them on launch.
Also to improve graphic quality. use your system search function and look in the SFC 3 and sub folder for *.x files and delete them, the game will recreate them upon launch based on you Video card performance.
Finally, make sure you read the SFC3_Beta_1.01_v534_b.rtf file, it has some extras in it such as how to play the game without the CD in, how to enhance graphics, and other items.
Hope this helps.