Was running Intel RAID-1 error/repair verification overnight. Upon starting the day, I saw that 18.5.0.125 had downloaded overnight and a reboot was needed for it to install on top of the previous version. Did so. Now, Windows LIVE Mail application does not open (the Windows 7 "circle" spins...then disappears without opening LIVE Mail).
Re-rebooting did not fix it.
OS = Windows 7, 64-bit, Intel i7-980x processor, 6 core, 3.33 MHz, 9 Gb RAM, 1 Gb Video, RAID 1
While being a low-level techie, I will do some internet research, experiment and get back with any results within the next couple of days.