Post CU Startup fails but Restart OK

Post CU, when I switch on PC (after shut down) the start up process appears to complete succesfully except when I try to launch my browser I get Error window 'Server not found'. A few fix suggestions plus 'Try again' all fail.
However if I now Restart (via Start_ Power) the PC launches corectly.
Close examination has found one difference between Start and Re-start screens . During Start the 'Microsoft Mouse and Keyboard Centre' message does not appear on screen for a few seconds; where as this messge does appear following Restart.
I can't see any obvious link to the problem but is it just masking another problem (possibly faulty CU installation?
Any suggetions (including possibility of CU uninstall and re-install) would be welcome.
MikeA13

Hi Ken,
Thanks for your prompt response however I have not (so far) had success.
Using cmd I acccessed command line which came up as c:\Users\(my name)>
When I press Enter the above command line is repeated.
I then copied/pasted your suggested command line and pressed Enter. This brought up error message ‘Unable to perform operation. Unexpected error’
Thinking that Users/(my name) was not the 'admin' you referred to I tried entering my admistrators name. This brought up 'invalid command' message.
I then stirred the old grey cells to get back to basic command prompt using cd\ . Haven't used that since my very early computing days way back in the BW era. (BW = Before Windows).
Sadly all my efforts failed. So maybe my aged brain needs some additional basic instructions in how to achieve what you wrote.
Finally I opened Control Panel / Power Options to check Hibernation setting. Its box was not checked.
Regards,
MikeA13

Hi Ken,
Followed your instruction to Right Click Start Button.
This produced vertical list (white characters on black background) of options starting with Apps at the top; down to Run, Shut Down or Sign Out, Desktop at the bottom.
Sadly no 'command prompt (admin)'.
Searched through the above entries on list. Still no command prompt found.
Is there another way of disabling Windows fast Startup?

MikeA13

Hi Dalchina,
Thanks for your response.
I dont use Cortana but tried your alternative suggestion.
Same result as with Ken's. The prompt will not accept the command.
MikeA13

HI Galchina,
Having launched command I DO NOT get the screen you depict.
Instead I get the following: (myname hides my real name)


As I said in earlier post, adding the command as recommended by Ken brings the following error message;


Having read a number of articles on the web I am coming to the view that my problem lies with my Startup being the Fast version.
Question now is how to replace that with the FULL startup.
MikeA13

Hi Galchina,
Problem with second screen shot in earlier reply. It should have been;

Sorry,