Try below steps:
1) Open IIS Manager
2) Navigate to Default web site-> CAISD-> Handler Mappings
In that just check Static content again, it should be like:
static file * Enabled File or Folder StaticFileModule,DefaultDocumentModule,DirectoryListingModule Local
3) If its not showing file and folder , double click Static file-> request permissions- Check Invoke handler check box -> and select file or Folder and click on OK. And in Access tab it should have read option selected.
If above steps are already done please do below steps
4)Now click on "Dafault_web_site"-> and at right end of screen-> click "Restart" under manage website.
5)Click on IIS Name(after expanding that only you will see sites and application pools) and at right end you will see option to restart under manage server.
6) Close IE.Open any new browser(chrome or Mozilla) and try to access SDM.
Please check in again in IE after closing browser and deleting cache. Launch fresh IE and try.