By default GPG4win stores the keys in directory c:\documents and settings<username>\application data\GnuPG.
If you want different users to be able to use the same keyring you have to :
- Move (or copy, I’m paranoid…) the key files in a directory that all these users may access, say “C:\GPG_Common”
- Change the key location for EACH user (see Change the directory where keys are stored ?) so that all user point to this key
(attached is an example of reg file you can use)
GPG.reg (226 Bytes)