anyone had any luck?
I am at my wits end with this and am unable to do any mapping and can't do any work on dod_vierville :(

please help me find a way to get it working again, it did work on this set up once but now when I try to start the sdk it says that it is preparing to start then quietly forgets about it as if it has been distracted by something shiny in another room or something

In your Steam app, right-click on HL2 (or any installed Valve game you own) and select the "Properties" option.

Then select "Set launch options..." and add the line "-32bit" to the edit box.

Close the dialog and launch the game you just edited (ie. HL2). When it has successfully started up, close the game.

You should now be able to run the SDK on your 64-bit OS. Note, however, that if you run any of your Valve games without the "-32bit" option, your SDK will go back to being incompatible and you'll need to repeat this process.

This means that if you run a game through Hammmer, you'll also need to launch that game with the "-32bit" command line parameter as well. The same is true running a game from a batch file, command line, etc.

thank you thank you thank you
respect praise and unlimited alcohol coming your way :D:D:D:D:D

now I hope I can do a decent job finishing this map :)

Don't thank me, I just copy and pasted it from the link on the Developer wiki :)