I know nothing about my dad's computer,as he said ,the computer was completely paralyzed and tried to open it, but an account appeared that he didn't even know about, and the password was wrong. I wonder if it was hacked by a virus or a hacker?
If it was an hacker then the computer and all the information on it has already been compromised. Wipe it properly and reinstall Windows. More than enough information on line to do this if you care to search?
You might be better off just installing a new hard drive and reinstalling it. At this point you may never be able to trust that hd again. Hd's are cheap.
A strange account appears on computer?This is the first time I have encountered such a strange problem.
Reinstalling it (Don't forget to backup your computer files),or break the locked account and password on computer,all you need is a bootable disk.
They will tell you what to do.