At work we've been having problems with printers... Like anyone that has to deal with printers.

They kept disappearing and reappearing for users on every log on.

We got a support contact with Microsoft because it was group policy doing it.

Their final solution (after weeks of remote sessions and long phone calls) is to install pstools on every machine, and run about 7 commands as the system user to delete and then re add registry keys.

ON EVERY LOG ON AND LOG OFF. WTF...

This is an educational institution where "computer hacking" is taught... It's not gonna take long before someone realises that pstools is installed...