F12 Developer tools,
Yes Browser mode should in most circumstances be set on ie10 not Compatibility view unless the webpage looks odd or video controls do not function/ comp-view will usually clear up those issues, Reset ie9 or ie10 manually, Click the Start button on the Taskbar, Click on Control panel, Click on Internet options, Change (View by on the top right to Small Icons) Go to the Advanced section, Click on Reset button on the bottom, Check the box to Delete personal settings, See a tutorial here, http://www.sevenforums.com/tutorials/1222-internet-explorer-reset.html
After reset open Internet explorer and check the box to accept the Recommended settings,
A popup should appear saying there are Add-ons ready to be Enabled/ Click on No for now.
While Internet explorer is open,
Hold down the Alt key and type TB or Menubar/ Tools/ Compatibility view settings.
Uncheck Display all sites using comp-view and also Uncheck Download updated comp-view lists from Microsoft automatically,
If any sites are listed in the Compatibility view box Clear them from the list/ Close window.