Did as suggested
On startup got message :
"You have used the System Configuration Utility to make changes to the way "Windows starts.
"The System Configuration Utility is currently in Diagnostic or Selective mode "causing this message to be displayed.
" Choose Normal Startup mode on the general tab to start Windows normally and "undo the changes you made using the System Cofiguration Utility."
Undid the following changes :
Closed and started
It booted normally again.
This is for your info.