Router error message at shutdown of PC

> Message: Netgear USB Control Center; ControlCenter.exe; Application
> error.

   That's a message on your computer about software on your computer.
It's not directly related to your router or its firmware.

> The instruction at 0x00000000771EC240 referenced memory at
> 0x0000000000000004. [...]

   That's what's known in the trade as a bug.

> Router works at next startup, so I wonder what this can be. [...]

   Looks to me like what it says: a run-time error in
"ControlCenter.exe", which seems to be part of some "Netgear USB Control
Center" package.

> [...] Any suggestions?

   Remove the "Netgear USB Control Center" package?  If you're actually
using it for something, then you might try installing it again.

> [...] I have the Control Center, but it does not seem to be able to
> control anything.

   "seem"?  None of that is a useful problem description.  It does not
say what you did.  It does not say what happened when you did it.  As
usual, showing actual actions (commands) with their actual results
(error messages, LED indicators, ...) can be more helpful than vague
descriptions or interpretations.