Need Help! Counter-Strike Source won't launch.

I click to launch CS:Source in Steam, and a Microsoft Windows window comes up and says "hl2.exe has stopped working, A problem has caused the program to stop working correctly. Windows will close the program and notify you if a solution is available." It doesnt notify me. I restarted Steam, and my computer and it still does it. Anyone know of anything else to do that can help? Thanks.

^ Sorry, dont know how that smiley face replaced the D in deathmatch, but it wont let me edit it, says 'not allowed to edit this message'..gamespot sucks.

Is it newly installed? or did it work ok b4? If so, have you changed anything on your pc or installed / uninstalled anything since it worked ok?

Yea, thats what I was kinda thinking I would have to do, just wanted to make sure. Also, by the waymy I-Tunes isnt playing musiceither,there is no sound, I click on a song, and nothing, not even the progress bar goes so I know its nothing to do with the sound, cause my sound is on and all the way up. I know that is kinda random,but a lot of issues have just started yesterday, you think I have a virus? Though I havent played any of my Source games in acouple monthswhile so I have no idea when they stopped working.

Is it newly installed? or did it work ok b4? If so, have you changed anything on your pc or installed / uninstalled anything since it worked ok?

IMP_ACT

Yup, sounds like uninstall steam, delete valve / steam folder, download & install from scratch I'm afraid.

A tip though. Once you've done that, configured your steam games, etc' Make a backup of the whole Valve / steam folder, preferably on another drive. Steam doesn't actually have to be installed to use. This means that if you have any problems in future, you can just delete the folderin program files& copy your backup version in it's place & you should be back up & running! You will have to let it update itself though.

I've also transferred steam from one pc to another in this way. In fact, I took my backup on an external HDrive to England. copied it to a friends pc & played CS:S from his house without having to reconfigure keys, favourites or anything!

go to steams forums and look up windows vista support. There is a long command that you type in that will fix the issue you are having.tarheelwill13

Delete the ClientRegistry.blob file and everything should be fine (this file holds your account info so probably something got corrupt and that's the reason you can't run source games...at least most of the times).Gamartto

[QUOTE="Gamartto"]Delete the ClientRegistry.blob file and everything should be fine (this file holds your account info so probably something got corrupt and that's the reason you can't run source games...at least most of the times).GreasyFetus69

Go to your steam directory*, in my case is "D:\Program Files\Steam", but if you installed steam at the default location then change D for C.

*right click your steam shorcut, select properties and then click the find target button, this will take to the steam directory directly.

ahhh! i have the same exact problem! whenever i start up cs:s, windows gives me the exact pop up saying that hl2 needs to exit becuase it failed to run or something like that. AND the itunes thing is similiar to mine as well! sometimes whenever i listen to music or watch youtube videos, my song doesnt start or make sound and the youtube videos stop at 2 seconds. ahh can someone help both of us?

i've reinstalled steam and cs:s and i've also deleted clientregistry.blob and nothing works! help!