Bootability

[Sebastian42]

Since the latest (and last ?) Win10 update, the only way I have been able to reach a functional desktop, is to diskscan my system drive from another disk - which finds NO errors - then tap F8 while booting - which may or may not lead to Safe Mode. Then a message displays, warning me not to remove the USB (which I had not inserted anyway). Without that procedure, the display is simply the dotted circle going round and round. HOW can I get back to reliable and fussless booting to a usable desktop ?