Microsoft released one update to fix the problem of Windows Explorer in Windows 8 as a component of its is causing Windows to go into a crash / restart loop. Issues so found in Windows Developer Preview are:
If you delete the notification database file or the file becomes corrupted, applications do not receive new notifications. When this issue occurs, you have to uninstall and reinstall the application to correct the state of the application database.
If you have application live tiles that use multiple image tile templates, you might encounter an issue that forces Windows Explorer to restart continuously. When this issue occurs, Windows Explorer goes into a loop in which it continuously crashes and restarts.
How to fix these issues:
This issue can occur because the corrupted or missing notification database file does not have an entry allocated to store the application’s notifications.
This issue occurs because Notification Platform crashes when it tries to renew the image file in the cache under certain conditions in which multiple images are requested from the Internet at the same time. For example, if the tile requests an image that is larger than 150 KB, the tile will not render. This causes a blank tile. If the failure to render is followed by a request that uses an expired HTTP heading to fetch an image, Explorer.exe will be thrown into a continuous loop of crashes.
An update named KB2617028 is released through Windows Update which resolves it. Just install the update via Windows Update and resolve the issue.