Try turning off the WDM Driver in Features.
Then reinstall MC25.0.114 over the top of the existing installation. Nothing will be lost. Backup the Library first if you are concerned.
Turn on the WDM Driver in Features again.
Restart MC.
Working?
If not, repeat but with the WDM Driver Feature enabled when you reinstall.
I am having the same problem. Came here from a google search. The above didn't work for me. I think there might be an issue with the driver.
I also disabled driver signing with "BCDEDIT /SET TESTSIGNING OFF" + reboot.
No amount of checking / unchecking the WDM box gets the driver in MC25 installed. This might not have anything to do with the signature check. Pretty sure it used to work with MC24, though, but I had deleted it recently. Time for a reinstall.
Edit: reinstalled MC24.0.75 .
The JRiver WDM driver works fine, though it shows up in the GUI as "JRiver Media Center 23" . I only have MC24 and MC25 installed, no MC 23.
FYI, both MC24 and MC25 versions installed are 32-bit . I can't use the 64-bit versions due to some incompatibility with the ASIO drivers for my soundcard.
Looks like this is a regression from MC24 to MC25 in the 32-bit version.