Issue: You need to force group policies to refresh on all domain computers immediately rather than waiting the default 90 minutes.
Solution: You can use PSEXEC to accomplish this feat.
1) Download PSTOOLS from Microsoft, extract and copy to c:PSTOOLS
2) Open a Command Prompt as administrator:
To update group policies on all domain machines: psexec \\* gpupdate /force
PSEXEC queries Active Directory for the computer names to run the command against, thus it will likely run against some computers that no longer exist or are turn off.
Note: you can also run psexec against a txt file list of computer names.