Maybe you should consider what is written there. Make Pc restart, could also make file check. And if not helping write to support a ticket with Status:2000014
Run cmd with Administrator rights and paste these bcdedit.exe -set loadoptions ENABLE_INTEGRITY_CHECKS bcdedit.exe -set TESTSIGNING OFF
Please keep in mind that if Your OS is runing in a TEST MODE You wont be able to run the client (this issue is mostly connected with AMD/ATI GPU's)