iis7 restarts unexpectedly

What can cause iis7 to restart unexpectedly and how do I prevent it?  
I did find a hotfix but it applies only to Vista platforms and the client computers are all Windows XP on the network involved.
This is running on a Windows server 2008.
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acusserConnect With a Mentor Author Commented:
This issue was resolved by editing the file "web.config".

Sorry I forgot to submit before now.
Emmanuel AdebayoGlobal Windows Infrastructure Engineer - ConsultantCommented:
Do you have Windows debugging tools installed? if not download a copy from http://msdn.microsoft.com/en-us/windows/hardware/hh852365

Install the tools and configure this to take dump when the unexpected restart happens.
Analyse the dump file

For more info, please check the link below

acusserAuthor Commented:
We found the solution our own selves and did not need to explore the answers given here.  Thanks anyway.
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