The specified module could not be found ( seems to be an IIS message , same in IE and FF ) .
Looks like something to do with application mappings in IIS need to be re-done, pointing to the old folder , might need to document some steps here
Not sure if you spotted other note ( to self ) , seems to be some registry / handler mapping clean-up to be done in switching from , in effect wc537 folder to wc540 folder , to make a clean cut-over .
???
+++ Rick ---