My friend's computer is infected with ransomware. She called the number on the screen and let them take over her computer. She thought she was talking to Microsoft. Now the computer is asking for a password which she never needed before. The guy on the phone said it will cost $200 for the password. My question is, if I use the OEM recovery partition to restore her computer to factory defaults, would you trust that to get rid of the virus? Is it possible for the virus to be lurking some where else? Do you think I need to wipe the hard drive and do a clean install? I kind of hate destroying the OEM recovery partition but I will if it is necessary. She is bringing me the computer later today so I have not looked at it yet. It's a Dell laptop.