I can duplicate a crash while searching the registry with regedit.exe. The problem area seems to be HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade. This behavior started after the upgrade to 10586.
I see this behavior on four different desktops after the upgrade. If I search the registry the search will continue normally up until HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade and then hang. Cancelling the search results in the "registry editor has stopped working" message. If I start a search after that key the search will complete without hanging. I deleted the HKEY_LOCAL_MACHINE\SYSTEM\Setup\Upgrade key and experience no problem with searching..
Can anyone else reproduce this error? I've cleaned up the leftover previous Windows installation and temporary installation files after the 10586 upgrade and I don't see any problems after deleting the key. Just want to make sure there are no unintended consequences waiting to byte me.