In terms of security on my computer it leaves a concern; i just want to known if its safe to have these unknown accounts and they're not for example a remote hacker of some sort especially when the last "account unknown" is related to a network of somesort that has access to files on my computer through a network/proxy which does concern me quite a bit and i hope not... although ive done some brief research on unknown accounts each forum is telling me a different story. If its any relation there was a standard user account that was created on windows 7 but has been deleted im just wondering if any one of them accounts has any relation to the unknown accounts.
Some software also creates accounts to be used by the program only. When removing these programs they sometimes leave files behind and since they no longer have an owner, they will show up like this.
You can most likely remove those accounts from the file's permissions with no ill effects. You might want to make sure someone (a valid account) has ownership of those files so that you can delete the file if needed.
Thanks for your replies im just thinking in terms of home network i have an dab radio downstairs that you can also stream of the computer music etc that might be to do with the: Account Unknown(S-15-80, and the device has been removed of the network so maybe and hawkeye i will do that or just remove all permisions for now on those mysterious accounts Cheers
Was the Hard drive pulled from another machine? Or is it always in the original system? Run Malwarebytes. If all checks out ok, Just delete them and see if they are showing up again.
Unless you know / use certain software that create user accounts to run services and other tasks, a general use Win 7 system shouldn't have these. Homegroup could add accounts I suppose but, I don't use Homegroup so, you might want to dig a bit about that -if you are into sharing via homegroup.