Avast Free version 18.8.2356, block the Razer mice driver?
My mice can not move, i uninstall 18.8.2356 and install 18.6.2349, back to normal.
OS: Windows 7, Razer Synapse 2 (Razer DeathAdder Elite)
You don't say what is blocking it or if there is a popup or message, etc.
But, given the lack of information - It may have been easier to exclude the mouse driver in avast (rather than reinstall an earlier version), probably the behaviour shield or the General - Exclusions.
OK, I update to 18.8.2356 again,
Not show popup or message, Add the Razer driver in exclusions not work,
I already know the problem is ( hardware-assisted virtualization),
It will make the Razer mice can not move and Nvidia control panel (Adjust Desktop Colour Settings) fail on windows startup.
Disable the (Enable hardware-assisted virtualization), back to normal.