Quartus (21.1 Lite) can no longer see my USB Blasters (Terasic) on Windows after auto-update

Hi folks,

I have been happily using Quartus Prime 21.1 Lite (Windows 10) with several Terasic boards (including DE0-Nano, Cyclone V GX Starter Kit, DE2-115) the last month or so with a new computer.

Yesterday, the computer did it's annoying "auto Microsoft update thing and reboot" - and today I have been unable to work with my boards anymore.

I tried reinstalling the drivers (DPInst.exe). I even rebooted into "allow unsigned drivers" and reinstalled them. However, nothing. I have no ability to see the boards. The Device Manager shows the Altera USB-Blaster when connected (driver date 8/16/2017, version 2.12.28.0). The does computer beeps when I insert and remove the boards.

I have tried several things:

• Uninstalling/installing the drivers, including a reboot with unsigned drivers allowed
• Different USB cables
• Different USB ports on the computer, with and without a hub

But none of this works - none of these things see the board:

• jtagconfig
• quartus_pgm --auto
• Quartus GUI using Quartus Programmer or Signal Tap UI
• The Terasic "Control Panel" for the board
• Running all the above as administrator instead of my regular user

My windows version is now 10.0.19044 Build 19044, HAL is 10.0.19041.1503. It runs with the hypervisor because I have WSL2 enabled.

BUT: Nothing has changed, just the computer decided to self-update and reboot overnight.

Please help??

Thanks!