Can't login to windows account

my pc is set to login without asking for a password.

when i switched on a couple of days ago it asked for my password

upon trying to enter my password i could not type any letters but i could type numbers - weird

after several attempts it asked me to type in a code to continue

the code was A1B2C3 and l could enter all of lt wlth no problem

l am not a computer noob and can usualy solve problems myself, which l have been trying to do for the last 3 days.

restart holding shift down gets me to the diagnostics screen

troubleshoot - advanced options - command prompt - 

this is where i find out bitlocker has locked my c drive

searching the net l have tried numerous suggestions, all to no avail lncluding the work-aroud from mlcrosoft of disabling TXT ln the BIOS, which i couldn't find anywhere

every thing i try ends up wanting the bitlocker recovery key

PC is a Dell Inspiron 16 plus 7640 windows 11

any suggestions or help would be greatly appreciated