Changing drivers using the properties page works - but only if getting/setting

Changing drivers using the properties page works - but only if getting/setting
security descriptors is disabled (as it is in this code).

If get/set sd's is enabled spooler.exe crashes on NT.

I'll investigate and fix that issue next.

Jeremy.
(This used to be commit 8c9ed874363e6a710bc0fe521bb8c4f7ee219587)