I had the same problem as you when upgraded my Win7 to Win8. Some websites suggested that antivirus might cause the metro tile not working. Uninstalled Norton antivirus and the metro tile works. Re-installed Norton and metro tiles still working. You might want to try uninstall your antivirus and see if it works.
Finally problem solved.
I did uninstall mcafee antivirus however that did not solved the problem. Had to run an mcafee uninstall tool to totally remove all traces of the antivirus and it worked.
Now all windows functions are working flawlessly.
Thanks for the help guys
P/s Did try to return to windows 7 using recovery disc, however after installing the 3 disc successfully, windows 8 keeps restarting. no trace of windows 7. Anyways windows 8 working now, will stick to it..starting to enjoys the speed.
Cheers
