This application has requested the Runtime to terminate it in an unusual way

This application has requested the Runtime to terminate it in an unusual way
Question

My Source games crash with a C/C++ runtime error message - what should I do?
Answer
Microsoft Hotfix

We have received reports of this issue for Source-engine games - it is recommended that you install the Microsoft Hotfix which addresses this issue.


Corrupt Game Files

Make sure your game cache files are not corrupted by following this guide.


Viruses, Spyware and other Malicious Software

Run a complete system scan with your anti-virus application as well as a good spyware removal tool, such as Spybot Search & Destroy.