See instructions for changing the Computer's name: Change Your Computer Name in Windows 7, 8, or 10
Two concerns about using a used computer without doing a clean install of the OS would be remote access and
some possible illegal use of the computer that left some files... even deleted ones. Then there is malware...
If you decide to reinstall the OS...reformat then reinstall...it shouldn't be a problem if the hdd is the original one and the
OS wasn't originally Vista. The previous owner should be able to tell you whether or not the computer was bought new with 7 pro or not.
The previous owner should be able to tell you whether the hdd has been replaced or not.
EDIT: create a system repair disc...that should be done before making any changes.
How to....Create a system repair disc
Always a good idea to create an image of the entire hdd before making major changes. The image should be stored on an external medium.
You can use the program in Windows 7 for doing that. Back up your programs, system settings, and files - Windows Help
Edited by buddy215, 04 January 2016 - 05:57 AM.