Read the FAQ on the first page. There is a way to reset 7H settings so it can open again.
guessing this what you mean?
It's rare, but something wasn't setup properly. There are a couple things that can be done...
1. Delete everything at ...Users\<username>\AppData\Roaming\7thWorkshop and reopen 7th Heaven. If it opens, you will need to redo your Workshop -> Settings again.
2. Delete the mods in [gamedir]\mods\7th Heaven and reopen 7th Heaven. You will need to Uninstall the mods from the 7th Heaven UI and download them from the Catalog tab again.
if so i dont seem to have a appdata folder to go to delete them.
update: folder wasnt there but now found it else were and got 7th to open again