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BSOD "security checksum error" : severe after affectsd
Dell Optiplex 745 3ghz, 4G ram, 250G hd, 30G free. Windows 10 64 Home ed. Build 17763.1.
BSOD immediately after boot up. Could not reboot; bios would not load.
Replaced bios battery, reseated memory modules.
First after effect: Firefox & Nightly would only run in Safe Mode. DISM found nothing, completed successfully. SFC found and fixed damaged files. Browser problem fixed.
After effects:
Searches do not receive keyboard characters except in file explorer and control panel.
Windows Update & Security will not run!
Restore Points wiped out.
Can not restore from ISO on external hd.
Clean reinstall from usb stick fails.
No audio. profound Sound C# won't run.
Authentication reversed and can not be fixed.
DVDRW not recognized, system thinks it is a floppy.
Tried and failed:
Remove and uninstall problematic usb hub.
Windows Update Troubleshooter.
Tweaking.com Windows Repair.
DISM SFC.
Recovery Stick does not offer any repair options.