At work we have some sort of control-freak that think that he should dictate what screensaver people should use. So while the startup script maps all server drives (usefull) it also overwrites each morning to select the XP screensaver with a 30min timeout by adding the setings to the registry.

Now I prefer something a bit more inspiring like "my pictures/slideshow" with a 5 min timeout.

Tried a few things, but apart from setting the access rights for those registry entries to "not allowed" for everybody including admins I don't see an easy way.

Also tried to rename the screensaver I want to the default XP one, but every time I delete the default one, it gets restored automatically.

Oh yes, we are admins (but not "the" administrator) on our own machines.

Write a startup script on his machine that overwrites his local screensaver

That'll get it fixed

If this is done via Group Policy, there is no workaround unless you can move your PC or user account to a different OU.

If you are a Domain Admin, you should be able to do this.