I just upgraded my laptop memory and received two error messages: 1. kernel security check failure 2. system thread exception not handled. I have windows 10 Home x64 Version 1909 Build 18363.1139. All my device drivers are up to date . My laptop is a Toshiba L655-S5072. I upgraded from two 2GB DDR3 chips to two 4GB DDR3 chips. The Bios does recognize the full 8GBs but then I get the error messages and it will boot up no further. When I replace the original 2GB chips the computer works normally. Please help me with some options. I would definately like to have the additional memory. Thanks for your help.