If you got an "inadequate O/S privileges" message, you probably have windows vista. Sof2 & Windows Vista seem not to be very good friends. To play Sof2 on Windows Vista, you have to make sure you logged on an admin session at windows startup.
This can be accomplished by setting certain privileges for the user that will run the game. To do this, first temporarily log in as an Administrator. Then go to Control Panel => Administrative Tools => Local Security Policy. This will open up the Local Security setting window. Expand the Local Policies folder and select User Rights Assignment. This will bring up a list of security settings for the computer. You will need to add the user that will be launching the game to have the following privileges. If the user is logged in while making changes, the user must be logged out and back in for the changes to take effect.