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?