is it possible for a virus to replace the level authority in windows 11/ 24H2

creachwest

Virus or not?

last sunday my computer(18 month old) did'nt start and turn during hours( turning circle).

With the technician office it is first detected that the last windows update 24H2 was turning wrong!

But after cancel of 3 applications which seems not stable it restart! A bit defender analysis show that the first high level authority( in windows) is changed over my level and a long serial of number and alphanumeric signs replace admin (myself).It was also impossible to install any software,and the main installed application were corrupted (office , photolab,google,vega software…and so on!)

It was not possible to update windows!!!

I decide to format all disks and reinstall last windows update.

Thank you for your comments and appreciate your advise