Did a clean install of today's released Nvidia Beta 266.35 drivers, and halfway through the clean install it was just stalling and not completing. Finally disabled all Avast shields from right click on system tray, and got as popup from behavior shield saying the untrusted process Nvsvc from the Nvidia drivers was being blocked, or was asking to make a decision so I allowed it to be able to complete the installation.
Just a report that the installation was stalling and not giving any clue as to why, never happens before. Until disabling the shields, then I get a popup from Avast which was causing it.
Windows 7 x64, behavior shield on default setting.
