Ryiuken, backup everything in your FF7 save folder, to thumb drives.
then uninstall FF7, then uninstall 7th Heaven.
then completely delete the FF7 folder, located in program files/steam/steamapps/common.
then completely delete the 7th Heaven folder, and re-start your computer.
then check that those folders were completely deleted, and if so, re-install FF7.
then paste everything from your thumb drives, back into a new FF7 save folder.
finally, re-install 7th Heaven.