Delete the SFC 3 game folder off of your system.
Turn off any Anti-Virus services that you have on your system
Put in the SFC 3 Install CD.. Close the screen that pops up.
go into my Computer, right click on the CD Rom that has SFC 3 in it, click Explore.
Double Click "Setup.exe" and install the game again.
Then use Windows Control Panel to Uninstall the game.
Delete the SFC 3 game folder again.. eject the CD, then put it back in.. now select Install from the selections on the window that pops up.
this should have your game sorted...
then finish following the patching instructions for the Single File Installer that I posted at the top of this forum.