At two separate sites today we have seen the same thing - computers that have unexpectedly hung, and after a forced power cycle the PC fails to boot. We have diagnosed this to the installation of an update yesterday (17th June 2015) of the Trusteer Endpoint Protection product.
The only solution we have found is to perform a system restore and then to prevent this issue recurring, to remove the product. This has happened on a Windows 7 Professional based PC and a Windows 8.1 Professional based Microsoft Surface Tablet.
Over the years we have seen a number of issues caused by the Rapport service and our advice is to remove the software from your PC entirely. Don't let your bank force this awful product onto you.
If you are experiencing issues with a non booting PC and you are based in Norwich or Norfolk, please do give us a call today on 01603 55 4000, it might be this product that is causing the problem.