32 Bit Web Service no longer works after windows update

Question

I have a 32-bit web service that was running fine prior to April 9th.  After some Windows Updates it now gives me the following warnings/error in the Event Viewer.

A listener channel for protocol 'http' in worker process '9760' serving application pool 'REWebService' reported a listener channel failure. The data field contains the error number.

Application pool 'REWebService' is being automatically disabled due to a series of failures in the process(es) serving that application pool.

The "Enable 32-Bit Applications" setting in the Application Pool is set to true and this web service has been working fine for a couple years.  It needs to be 32-bit because it uses an older proprietary .dll that is 32-bit.  

I've tried various suggestions that I have found over the internet without success.