Hi
I upgraded my son's laptop from Windows 7 to Windows 8 Pro. I has been working fine for a few weeks. But now when booting It halts iwth the error code 0xc000021a. I have tried the following options
Refresh - this fails with the error 0xc000021a
System Restore - this fails with 0xc000021a
Safe mode boot does not work
I can start the cmd console
Any suggestions as to how to proceed?