Credential Manager has been disabled by Administrator and cannot re-enable

I'm having trouble getting a Windows 7 work computer to keep credentials for a mapped drive. Whenever I load Credential Manager, I get "Windows Credentials have been disabled by your Administrator." I'm logged into an Administrator account (but not the built-in account), and haven't had much luck removing this restriction.

The computer is not on a domain, so there is no domain policy enforcing this. I checked gpedit.msc, and looked under:

Computer > Windows Settings > Security Settings > Local Policies > Security Options

I found the option Network Access: Do not allow storage of passwords and credentials for network authentication, but it is already disabled. I performed this check on both the server and user computer.

I made sure it is in the same work group as all of the other computers. I tried CCleaner to see if maybe there was a registry issue, but it just found missing .DLLs and unnecessary file types.

I was trying VaultCMD in Command Prompt, and created a new Vault, but I don't have the proper option to store the credentials for the server.

Any suggestions? Thanks in advance.