If your disk is a StarFarce - er... StarForce disk, then see what blackswan40 can direct you to in that PM he sent. He is a wiz at helping folks in that regard. In the meantime, you cannot do two supermods at the same time in the same SH3 install.
Uninstall your current SH3, then re-install it to a folder of your own making, as suggested above. Leave that install alone for future use as a known-good back-up. If you want to, you could create an archive file (7-zip, WinZip, whatever), and then use that to make your other "installs" by making another folder (or two or three) and then paste a copy of your original SH3 install, or the archive in there. Unzip if necessary, and mod that copy. You would have to make your own short-cuts to the SH3.exe file. If you do more than one copy for doing another large mod, then you would need to use
MultiSH3 to create new Save folders for each of the other copies of the game. Be sure and read up on the use of that and ask questions if there is any doubt in your mind of how to do it.