When opening any material, VMT Editor throws fatal unknown error (doesn't show it) and then crashes.

Windows states that this is APPCRASH and the error happens in the Qt5Gui.dll module.
I think the crash occurs right before rendering a texture.
It works fine if you don't open any material with texture.
If you open a material without $basetexture and then use Diffuse field to choose the texture, VMT Editor throw these errors:

and closes when i click OK.
Is this something wrong with drivers? They're pretty old but there's no updates so I use what I have.
OS: Windows 7 x64
When opening any material, VMT Editor throws fatal unknown error (doesn't show it) and then crashes.

Windows states that this is
APPCRASHand the error happens in the Qt5Gui.dll module.I think the crash occurs right before rendering a texture.
It works fine if you don't open any material with texture.
If you open a material without

$basetextureand then useDiffusefield to choose the texture, VMT Editor throw these errors:and closes when i click
OK.Is this something wrong with drivers? They're pretty old but there's no updates so I use what I have.
OS: Windows 7 x64