Recently there have been some issues with Source engine games and certain Anti-Virus applications. These issues can cause game crashes and prevent the Steam Community overlay from functioning.
AVG 7.5 and NOD32 have both been confirmed to cause crashes with Source engine games. Here are some examples of the symptoms you will see as a result of this issue:
1. A warning message telling you to reduce your screen resolution.
2. A error message about failing to lock the vertex buffer.
3. The game hanging with steam.exe at 100% utilization (or 50% utilization on a dual core, or 25% utilization on a quad core).
4. A hang while connecting to servers.
If you are running either of these Anti-Virus programs then they need to be fully disabled while playing.
Kaspersky anti-virus can also prevent the in-game overlay from working correctly. Kaspersky has provided a work-around that can be found [link=http://supportwiki.steampowered.com/wiki/System_Problem:_Antivirus_or_security_software_reports_Steam_is_malicious]here[/link].
Please be aware that they are working with these companies to improve these issues.
As always, it is suggested closing as many background applications as possible while you are using Steam. This includes Anti-Virus and Security related programs.
[link=http://forums.steampowered.com/forums/showthread.php?t=603853]http://forums.steampowered.com/forums/showthread.php?t=603853[/link]
AVG 7.5 and NOD32 have both been confirmed to cause crashes with Source engine games. Here are some examples of the symptoms you will see as a result of this issue:
1. A warning message telling you to reduce your screen resolution.
2. A error message about failing to lock the vertex buffer.
3. The game hanging with steam.exe at 100% utilization (or 50% utilization on a dual core, or 25% utilization on a quad core).
4. A hang while connecting to servers.
If you are running either of these Anti-Virus programs then they need to be fully disabled while playing.
Kaspersky anti-virus can also prevent the in-game overlay from working correctly. Kaspersky has provided a work-around that can be found [link=http://supportwiki.steampowered.com/wiki/System_Problem:_Antivirus_or_security_software_reports_Steam_is_malicious]here[/link].
Please be aware that they are working with these companies to improve these issues.
As always, it is suggested closing as many background applications as possible while you are using Steam. This includes Anti-Virus and Security related programs.
[link=http://forums.steampowered.com/forums/showthread.php?t=603853]http://forums.steampowered.com/forums/showthread.php?t=603853[/link]
