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Does this happen on other games? Did you recently tweak a setting (prior to -gl) in Garry's Mod?
When did this start happening?
It sounds like you have a corrupt driver, that D3D device error is usually if your GPU's drivers aren't working and won't work with DirectX.
http://www.guru3d.com/files-details/display-driver-uninstaller-download.html
Read this page and uninstall your drivers, this tool thoroughly uninstalld drivers, down to the registries and cache. Any problem your driver may have had will be removed, you can then boot back up and install your new drivers.
EDIT: Oh alright well that works, no idea why that would cause that error, Windows + Nvidia = disaster couple.