Internet Explorer 10 is pretty nice but IE10 Release Preview for Windows 7 is buggy and causing users more trouble than good! Well, it's supposed to be buggy. 
Several Windows 7 users have posted on Microsoft's support forums, asking for help as Internet Explorer 10 Release Preview has broke down the Aero theme on Windows 7.
"I have dual monitors, one is on landscape orientation and the other is in portrait orientation. I noticed when I switched the second monitor from landscape orientation to portrait orientation aero breaks. The OS shows the basic theme rather than Aero."
There is no workaround for the problem at this point, and Windows 7 users have no other choice than to go back to Internet Explorer 9 to re-enable Aero.