After installing SP3 on a XP Pro Toshiba notebook only the "Admin" account I had created with administrative privliges appears on the Windows log in screen. I had set up three User accounts for myself, my wife, and a "Visitor" account, all with limited privileges, and none of these three accounts appear. I can successfully log onto any of of these three accounts from the log on screen using the double Cntl+Alt+Delete technique. All three of these accounts appear in the Administrative Tools/Computer Management/System Tools/Local Users and Groups/Users window with no red Xs or other warnings.
The origins of this problem probably lie in the method that I uses to install SP3. A number of attempts to upgrade from the Windows Update site generated an "Access Denied" error relating to backing up some registry key. Microsoft has a fix posted as KB949377, and I had to download the upgrade file to my computer and then use the following steps posted there to install SP3:
Method 3: Reset the registry and the file permissions
1. Download and then install the Subinacl.exe file. To do this, visit the following Microsoft Web site:
2. Start Notepad.
3. Copy and then paste the following text into Notepad.
cd /d "%ProgramFiles%\Windows Resource Kits\Tools"
subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f /grant=system=f
subinacl /subdirectories %windir%\*.* /grant=administrators=f /grant=system=f
secedit /configure /cfg %windir%\repair\secsetup.i
nf /db secsetup.sdb /verbose
4. Save this Notepad file as Reset.cmd.
5. Double-click the Reset.cmd file to run the script.
Note This script file may take a long time to run. Additionally, you have to run this script as an administrator.
6. Install Windows XP SP3.