Help with GMOD 9

I recently downloaded & installed GMOD 9, but I can't run it. I only have DOD:S. Do I have to purchase CS: S, for this to work? If so, is it worth it to just buy the package that includes GMOD 10?
I think you have to have Half Life 2. Gmod 9 has a lot of half life models so you might need it.

Im not sure if gmod 10 requires HL2. Im pretty sure it does.
If he has DOD:S he already has HL2 installed, just not.... decrypted? I dunno man. Try restarting steam and deleting clientregistry.blob

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