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IIS 7 issue

HI, I am having a problem in my IIS server. It is always giving a message error in the Aplication pool:
A process serving application pool 'Classic .NET AppPool' suffered a fatal communication error with the Windows Process Activation Service. The process id was '5028'. The data field contains the error number.

I dont kno what can be the problem.
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check the event in event viewer...
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on the event viewer is the same message. and my website stops when it gives the message.
I have a clue what is the problem.
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Sanjay Santoki
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Its seems to me you have 64bit machine and didn't enabled 32 bit for your website that's why you are getting this error. If you have already done this then remove ASP.NET 4 and reinstall it and problem should go away for you.

To enable Application pool in 32 bit support in IIS7 please refer the following article: