Problem injecting.

After upgrading to windows 8.1 from windows 7, both 64-bit, I am unable to inject dll files into garry's mod.

I have tried reinstalling the game, tried two injectors, allowing the injectors through the firewall, updating my pc, and nothing is working.

The bypass I was using has always worked for me until now, it just doesn't do anything.

Any advice except downgrading my OS?

Thanks.

Well unless you can find a injector compatable with your current os the I don't think your going to have any luck :/ could try running as administrator but I feel as though you probably already tried that! What injector are you using may I ask?

I'm also running Windows 8.1 now, and public bypassers doesn't work on it.
Make your own or ask the coder of the bypasser you use to recompile it under Windows 8.1

just download another injector maybe that'll help