Hammer question

Okay, whenever I start SDK I go down to the menu, ( engine is episode one ), and I try to change the current game to counter strike: source...

However, this doesn't work. The only two options that work are; Episode one, Half Life 2

Basically, I click counter strike: source, the dialog box closes, and Half life 2 is still selected.

Does anyone have a solution to my problem?

I've tried to reset configurations, and I've followed the how to: setup hammer for counter strike: source. I've even uninstalled and reinstalled SDK and configured it again.

Thanks.

Do you own or have a VAILD copy of counter-strike:source?

Everything I own on steam is valid.

I've even used hammer for counter strike: source before, and I haven't changed any settings since then.

Do you have a updated SDK? do you have SDK base?

I just re-downloaded it from STEAM, so yes.

I have SDK Base and SDK base - Orange Box

Updated steam? because it work for me.

I've restarted steam 20 times trying to fix the problem, so it would've wanted to update.

Unless you have update disables somehow.