Gmod fails to launch.

I keep trying to launch Gmod, but it fails to launch every time. It just sort of… gives up. No error, nothing. Tried deleting .BLOB files, but that didn’t work, after the updated it still didn’t launch.

I haven’t changed anything about gmod, and I’m really not looking forward to a reinstall, as I have over 2 gigs worth of minimods I don’t want to piddle around with again.