Looks like MS tried to repair a bad stuxnet patch and it may cause a reboot loop.
The patch is KB3033929
A little more info is here: https://krebsonsecurity.com/2015/03/ms-update-3033929-causing-reboot-loop/#more-30322
Hold off on applying that patch, if you can. If you get applied it and have problems, go into safe mode and uninstall it (It will be under control panel>programs>programs and features>installed updates in the Microsoft Windows Sub Section and would have been applied this week. The entry you are looking for should look like
Security Update for Microsoft Windows (KB3033929)