Hi!
I thought this issue was resolved with Windows 8.1, I've only seen it on Windows 8 computers...
Have you checked the following thread to see if this could be the answer to your problem?
http://superuser.com/questions/681003/tiworker-exe-very-high-cpu-usage
Best regards
Andreas Molin
Andreas Molin | Site: www.guidestomicrosoft.com | Twitter: andreas_molin