i logged into windows 10 app store

Hello Ten Forums

my mom has windows 10 paid for OS for office work. i signed into Windows 10 app store then i signed out from my microsoft hotmail login page "De-Authorized" the windows 10 from my account. NOW! the windows desktop icons have disappeared and all the files are not on the hard drive "they appear that way" but the thing is after i signed out of the Windows 10 app store weeks ago the pc was still working perfectly fine all the files where there and microsoft office was working fine now microsoft outlook 2010 is requiring a new account sign up ...... have i done something to destroy the pc

Please Tell me how to get it back to normal! the pc only started doing this after a power cut and the computer was turned back on

the thing is my mom opened a Ransomware Virus or malware file and it basically destroyed alot of files but alot was backed up so an IT guy came to install BitDefender & Malwarebytes anti-malware software so the threats were supposedly quarantined and erased then the pc worked fine for 2 weeks. did i do anything to destroy the pc or is it a threat that is not detected