ASP Error in Windows 2000

My client server hard disk failed and I copy his data to a new Windows 2000 server. Prob is all ASP Pages cant work 500 error, with Application Pool set as Medium, only when set as Low will they work. Anyone know why and how to solve?

Basically his hard disk is gone, I install a fresh copy of Windows 2000, overwrite with the backup data and reinstall the drivers.

Crazy thing is low and high isolation mode works, just medium don't work

 

 

 

 

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