Hi Keith,
The System Admin account should be your reserve and not used for day to day
activities. Create another profile/account and give it Admin privileges.
To copy a profile:
How to Copy a User Profile
http://www.kellys-korner-xp.com/win_xp_logon.htm
HOW TO: Create a Custom Default User Profile:
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q305709
Note: Once you create another Admin profile, the System Admin profile will
be removed from the Welcome Screen. If per chance, you still want it listed
there:
TweakUI/Logon/Show Administrator on the Welcome Screen
http://www.microsoft.com/windowsxp/pro/downloads/powertoys.asp
Or...
Enable/Disable Administrator on Welcome Screen (Line 5)
http://www.kellys-korner-xp.com/xp_tweaks.htm
However, this will also contribute to the issue discussed below.
As per your issue, this is probably due to the .Net Framework update. If
so:
1. Go to Start/Run and type in: control userpasswords2 and press ok.
2. On the Users tab, left click your user name then clear the Users Must
Enter A User Name And Password To Use This Computer check box and then click
OK.
3. In the Automatically Log On dialog box that appears, type the user name
and password for the account you want to be logged on each time you start
your computer.
Tip:
Add Control UserPasswords2 to the Control Panel (Line 1)
http://www.kellys-korner-xp.com/xp_tweaks.htm
Welcome to Windows Screen Appears When You Start Windows XP After You
Install the .NET Framework 1.1:
http://support.microsoft.com/?kbid=827072
Either way, good luck!