There is no other save game editor rather than FMM- Neither of the current Scout tools ( Mini scout and Genie scout ) are reslly compatible with 8.0.2 altho miniscout is promised to be out soon.
I am no computer expert but I am struggling to understand that you cannot delete the FMM folder either manually or using a third party uninstaller program- but you are the expert.
you need a registry cleaner (Do not try and edit your registry yourself unless you really know what you're doing) - it's probably a messed up registry entry that means you can't "uninstall" it. There's probably a few on the net that you could get on a trial version, I'd recommend Registry Mechanic but it's not free.