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

I recently installed windows-7 home premium 64-bit on my computer. I had two accounts on it. One admin account and one account of the type "homeuser" (I think it was).

This morning when started the computer only the admin account was visible.
Logging in using the admin account I could see that the other account was also missing from the "Manage Accounts"-view.
The files for the account in the user-folder was still there though. I tried restoring my computer to the state before installing a update last night but to no avail. I could still not see the account or log on.
Running the command "control userpasswords2" I could see that the account was there though and by removing the need for passwords and setting it as default I was finally able to use it.
It is still missing from the "Manage Accounts" though and if I log off then I still can't login using it.

I found one site where a similar problem was described and that the reason was that the account had been disabled. The solution was simple:
Open "Computer Management" and navigate to "Local Users and Groups" and enable the account again. The problem is of course that in Windows Home Premium that option is not available since it only exist in the Business version.
So finally the question is: 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"?
Or, is there any other ideas as to why my account has hid itself? :)

EDIT:
Thank you Molly for your suggestion, unfortunately it didn't work. It is still not possible to see the account at the login screen or in the "Manage account" view. Though interestingly it is possible to see it in the parental control window.

Any other suggestions to why the account has disappeared and what can be done to fix it? I can live with my workaround but it doesn't feel that stable.

Answer

I just had the same issue on a Windows 7 Pro x64 box, and never had any issues on Windows 7 Ultimate x86/32bit version.

I will assume that it might be a 7 Pro issue, or bad port on Microsoft's part to x64 (or a bad software combo on a Lenovo due to all the tweaks they do with all the goofy bloatware software preinstalled.

I restored from scratch, did all updates, installed office, did all updates, set Admin passwd, enabled Admin account, rebooted. User wasn't available, but I used that user to do ALL UPDATES AND INSTALL ALL SOFTWARE. User was able to be seen in Computer Management, and not disabled account, yet could not see the user during logon, nor in CTRL PANEL in users.

Deleted the account through Comp. manage and recreated, and all is well (after deleteing the profile as well)...