I have another workaround, but before doing so, make sure the implicated processes aren't running.
1) Open task manager and in the processes tab, click "Show processes from all users" and kill these if found:

OR restart computer, whichever is more convenient for you.

This is for 64-bit Windows. If using 32-bit, syswow64 = system32
2) Run command prompt as admin and type:
After entering the line, you should get SUCCESS. Take note of the quoted username given in the line.
Now type:
where (USER) is everything given in quotes in the SUCCESS message.

After entering the line, you should get processed file. Now type:
After entering the line, there won't be any messages, but gameux.dll should be renamed and hopefully SC will work now. If that still doesn't work, try repeating the process for system32 instead of syswow64.

I'm running on 64-bit, I'm getting an 'unrecognized command' error on the '/f' line. Is it supposed to be /f:on or /f:off?

Apologies, I've mistakenly left out the command for that line. Should be:

Bah. Getting an 'Access is Denied' on the last line. On both syswow64 and system32 attempts. Even though I ran cmd as admin. Did some quick googling and apparently windows is extremely overprotective of gameux.dll for some reason even though it's an obsolete file nowadays.

Post has been edited 1 time(s), last time on Jun 24 2019, 9:27 pm by Pandut.

Does %username%:F work instead?

Negatory. Should've noted that I'm getting a 'No mapping between account names and security IDs was done' message after doing the cacls command, on both (USER) and %username% attempts.

Other than right-clicking on gameux.dll and trying to change the permissions directly through the properties screen as a last resort, I don't really know how to help you at this point. No clue why your Win7 is giving you so much trouble.