System has 3 accounts: Administrator password protected, and two standard user accounts. The guest account is off.
On both startup or "swittch user" the login screen only shows the system admin account icon and the password field is waiting for input. Although the two standard user accounts still show up in the "manage users" control panel utility.
Problems started as "the user profile service failed the logon". Logon screen showed all three accounts, but one of the stanrd user accounts couldn't be successfully logged into.
Followed http://support.microsoft.com/kb/947215 method #1 to edit registry and rename/copy/edit the S-1-5 keys. There was a S-1-5 .bak for the problem account. After editing the registry, and upon reboot only the system administrator account appeared.
Used windows restore to try to go back before the problems. The first restore point I picked failed to "install" on reboot, reported that either the restore point had problems or anti-virus program was blocking the restore. Disabled AVG, still wouldn't "apply" the restore. So I picked an earlier point in time, that restore installed without errors. The system has been rebooted several times, windows has applied patches on one of the reboots.
I tried a few other things and got non repeatable results. Once created a new standard user account. The "other user" logon icon appeared for "switch user". I tried login into one of the standard user accounts and it succeeded. I have since deleted this fourth account.
My wife logs into one of the standard accounts. I would like to get that working again. Since I don't know what is going on I am asking for advice.
Dell inspiron laptop, Win 7 home premium