The account I'm using right now (and this is also the account I used to make change on services.msc) has the admin rights, although at
Safe Mode another account named Admin exists and also have the same password with my already existing account.
I tried making changes in safe mode and it is successful. Already scanned for malware using Malwarebytes but found nothing. Didn't tried
to make a scan with ESET Smart Security since it takes too long. Got any more suggestions?