I am working on an Acer 5334-2598 for a friend. It's her kids' computer and she has been running several years without any kind of antivirus. I installed AVG Free, ran Malware Bytes on it, as well as Adware and autoruns. I've removed quite a bit of junk and viruses, but it will not install any updates to the OS from Microsoft. The computer is running Windows 7 Home Premium SP1. When I try to install updates, it gives me the unknown error code. Right now, everytime you turn off the computer, it tries to install 89 updates, which it never can do, because they always fail. Any help or ideas would be appreciated.