vb.net - Moving old DNN website to IIS 8 hover menus don't work -

i have been asked move old dnn website windows 2012 r2 server.

i have managed , running hover menus not appearing on website when running on iis 8.

this website written dnn version 1 using visual basic , .net 1 not planning upgrade new version of dnn.

i have gotten project run in visual studio 2010 .net 3.5 framework.

has seen behavior before?

also can dnn 1 website run on windows server 2012 r2?

edit:

the screenshot current production site drop down menu shows when hover on "cards" instance. on iis 8 server nothing happens when hover , same project.

i have done inspect element on horizontal menu item on both versions of web site , elements different in both.

edit 2:

i have been getting error in immediate window in visual studio:

a first chance exception of type 'system.argumentexception' occurred in solpartwebcontrols.dll