Vista - System Restore doesnt restore drivers.
 

During some beta work, I had to use system restore, which I assumed worked like XP SYS Restore, Wrong!

All printer drivers are not restored, yet the app resides.

Anyone else come across this?

I'd be interested to know this too - i've been diligently setting restore points when i've been updating software/drivers

Like I said, I was doing some Beta work for NOD, which the system kept looping, so I done a restore, which should have restored all drivers not just a few.
If you have your installation backed up, try a restore and see if it does the same.
Most drivers were ok, but I think these were generic anyway. Its only my printer which was affected. The Control centre for the printer was installed but no driver.
Deliberately I have not installed SP1 for Vista as of yet due to the beta work I do.