I am running Za 7.1 Vista retail and I have occasional black screen with only the cursor visible, but if
I switch to another user account
via task manager the desktop appears on the second opened vista account.
When this happens the whole system becomes slower and takes an age to shutdown and sometimes never shuts down and
I have to restart the system.
I often get ZA program alert for "Local Security Authority Process" when switching between accounts as well.
So this is happening on the retail Vista version as well and I have a relatively clean installation of Vista at the moment i.e. just
Microsoft office and ZA Suite.
I don't know if this is any help but thought I would post, just in case.
Vista Home Premiumintel core 2 6600nvidia GrForce 8800 GTS Driver