User-account missing from "Manage Accounts" in windows-7 64bit

Solution 1:

I just had similar problem - I created new user (using Manage Computer, Local Users and Groups) and this user is not visible in login screen nor Manage Accounts.

So I noticed that user belongs only "Homeuser" group and NOT to Users group. So I add it to Users group and all works now, user is visible in login screen and Manage Accounts.

Solution 2:

Is there a way to either control the state of an account and enable/disable it without using "Local Users and Groups" or if not is there a way hack windows to enable "Local Users and Groups"?

yes, you can enable/disable a user account through the Windows registry, as described in this tutorial:

How to Hide or Unhide a User Account in Vista (works in Windows 7)

see Method #2

Solution 3:

I believe I may have an easier answer, providing you know the name of the "missing" account.

You can also do the following from a command prompt (Start → Run → cmd) in Windows 7 Home Premium:

net user "someone" /active:yes

To disable an account without deleting it (will also hide the account from the control panel UI) you can likewise do this:

net user "someone" /active:no