After enabling web publishing all web pages previously available show a message 'service unavailable'.
On checking event viewer the following errors appear:
ISAPI Filter 'C:\Program Files (x86)\FileMaker\FileMaker Server\Web Publishing\publishing-engine\web-server-support\iis\isapi_redirect.dll' could not be loaded due to a configuration problem. The current configuration only supports loading images built for a AMD64 processor architecture. The data field contains the error number. To learn more about this issue, including how to troubleshooting this kind of processor architecture mismatch error, see http://go.microsoft.com/fwlink/?LinkId=29349.
Could not load all ISAPI filters for site/service. Therefore startup aborted.
Application pool 'DefaultAppPool' is being automatically disabled due to a series of failures in the process(es) serving that application pool.
Please could someone help me to resolve this issue?