For some reason when i got to the part where you launch the rocket into space at the end of on a rail it crashes the game. When i open the door to the outside it has lagspike for 2 seconds then contiues. So i kill all the millitary troops and when i go up the ladder where you have to break to glass the game just quits running. It was working fine but now i cant even get pass the opening tram section without the game crashing. So is there a fix do i have a bad install please help me. 
What kind of crash were you getting? Any error messages?
Go to āSteam\steamapps%username%\source sdk base 2007ā and take the most recent .MDMP file, upload it, and post it. Thatāll help the devs find the problem.
You can also try verifying the SDK Base 2007 game cache, and see if that fixes anything. If the games not even making it past the tram section, something in the Base probably got corrupted somehow.
i dont get any error messages all it does is exits back to my desktop i did the affinity trick but that didnt help my computer runs other source games just fine like hl source or hl2
i did check the game sdk base 2007 game cahe it said it was fine and no i cant get pass the tram section without it crashing but i talked to a freind he said he had the same issue and he reinstalled the sdk base and it worked just fine so ima try that
ok here it is hopefully this will help cause i tried reinstalling source sdk 2007 didnt help
hl2_3943_crash_2013_9_22T15_15_4C0.mdmp (137 KB)