I think I can answer 2 of your embedded questions, unfortunately I am unsure about Windows Defender.
To change to the regular windows xp logon screen (the one with the blue background and icons), go to
1) START -> CONTROL PANEL -> USER ACCOUNTS.
2) click CHANGE THE WAY USERS LOG ON AND OFF
3) make sure the checkbox is enabled for USE THE WELCOME SCREEN
to delete your other local user administartor accounts. navigate to
1) START -> CONTROL PANEL -> USER ACCOUNTS
2) select the account you wish to delete
3) select DELETE THE ACCOUNT and follow the instructions
note: you can only delete administrator accounts from an administrator account
to troubleshoot your windows update problem will be much trickier, can you post the windows update error? (you'll need to be using an administrator account to run and install windows updates) some things to start trying out:
1) confirm that your computer time and date are correct
2) open IE, go to TOOLS -> INTERNET OPTIONS -> SECURITY and select the button RESET ALL ZONES TO THE DEFAULT LEVEL
3) run a repair install with the windows os cd.
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by: KCTSPosted on 2007-09-02 at 16:11:39ID: 19818371
You can delete user accounts by right clicking My Computer, select Manage. Go to Local Users and Groups, and then select Users. You can delete from there.
Having multiple accounts in not a bad idea. If you want the Welcome screen back, so long as your comuter is not in a domain this can be done be selecting START->Settings->Control Panel->User Accounts and select Change the way users log on, and select Welcome Screen.