Avast Pro i seem to get lots of spywares but nothing more then that. I downloaded AVG internet security but it didnt find anything so i didnt bother pay for it. Just let the 30 day trial run out ^^
Ive had the same problem with MSN xD if you have an external harddrive make a backup and then reinstall/format ur harddrive. Then install everything that you got...If that doesnt work you can always take the old stuff from the backup back onto the computer If you dont have an external harddrive i wudnt take the chance of it not working. Its probably something small in regestry or something like that that is telling the computer that you have installed it from before
Uhhm...ive had the same problem but it was with BF2 on my old laptop. It wud go into the game but quickly exit again. Either your computer doesnt have the right qualifications or youve messed with some stuff. Try uninstalling/deleting local content AND deleting EVERYTHING in the Counter Strike Source folder. Dont just rely on the delete local content cus that only takes a little part. Once EVERYTHING from CSS is deleted try reinstalling ;)
Cant think about anything else that wud help
If that doesnt help go to Steampowered.com and support ;) they will probably know how to help you ^^
WE MUUST ATTACK MORTOR! its morDor -.- Whaat? WITH A D, morDor. OOh etc