Windows 10: Blue screen start-up, Trouble shooting options require pass word, but won't accept my PW....

Dell Inspiron 3670 desktop PC . Display opens with "Your devise has a problem and needs to restart" Screen Immediately goes into repair mode. I go to Troubleshoot>Advanced Options>Startup Repair. Prompt asks for PW, but will not accept my PW. I tried my log in PW and my Microsoft acct. PW, no go with either. I tried resetting my MS acct. PW, but still nothing.. The only item in the advanced options list that does not require a PW is Startup Settings which would allow me to enable Safe Mode, but when I try, it crashes, and goes back to "Your devise has a problem screen" In summary: I cann

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my laptop will not accept my PW and have no disk

my laptop will not accept my pass word have no disk

 

Home screen won,t start tried reboot won't start either.

Home screen won,t start tried reboot still won't start?

 

Windows 10 won´t start any program as Administrator

Hello. I´m having this issue since installed one of the latest Windows 10 system updates.

When I try to open any program that requires Administrator confirmation (that screen with the Yes/No question), this dialog won´t appear anymore. The screen background stays darkened and nothing happens.

1. Using Windows 10 Home (x64)
2. My microsoft user account is properly checked
3. I´m the administrator of the PC
4. Already tried do create another administrator user account - same problem, no success
5. Cannot start any program/service that requires administrator authorization (not even regedit)

Please help!