I have a Windows Enterprise Server 2003 SP2 with .NET 2.0 SP2 Framework and two custom Windows Services generating the error ".NET Runtime version 2.0.50727.3603 - Fatal Execution Engine Error (7A0F3CD5) (800703e9)". It is increasing in frequency over time. The code has not been changed since 2007. The application was moved (by image) from one server to another. What may be possible causes for this?

Hi, It seems that you were using a customized application, so I guess the issue may cause by the application. I recommend that you contact the developer of the application to perform the further research. Best Regards, Vincent Hu