That’s 1.8.2 CMS and 1.8.2 player?
Could you also please open php.ini, find this line
always_populate_raw_post_data -1 and make sure it’s not commented out (no ; before that line in php.ini)
After that, please restart your web server and client.
I believe IIS installation might require some addtional steps as well, there is a community guide for that here - XIBO step by step Installation IIS 8.5 on WINDOWS SERVER 2012