Ever since I upgraded to SP1 drivers that are digitally signed by Microsoft's WQHL don't show up as being digitally signed. I recently installed nvidia drivers 30.82 which are digitally signed and I got the not digitally signed warning when I installed them? This also happened with the latest VIA 4 n 1's. Any ideas on whats going on here? Old drivers we uninstalled first - just in case you we wondering. Well I checked further and NONE of my drivers listed in the device manager are digitally signed - not even the microsoft ones. This is serious any help would be greatly appreciated.