Ender

Hey bro I had the same problem but I have a solution for you which will allow you to play left4dead without the error message and also will enable system information to be displayed in msinfo32. Here's what you do. Be logged on as an Administrator, open cmd prompt as administrator via right click and type in the following command without the quotes "net localgroup administrators NetworkService /ADD". Press enter, you should get a successful message. Exit cmd and try to launch l4d. Let me know if this helped. ;]