How to AutoLogon with Tweak UI ?

I am running XP Pro with SP3. I am the only user on this desktop machine and
I want to be able to autologon, bypassing the password and welcome screens.

In Display Properties Screen Saver I have unticked the box "On resume,
display Welcome screen". Under Power Option Properties Advanced I have
unticked "Prompt for password when computer resumes from standby". In Control
Panel User Accounts Change the way users log on or off, I checked box
"Use the Welcome screen" (as I didn't want the classic logon screen).

In Tweak UI Logon Autologon I have checked "Log on automatically at
start up" with my username displayed, clicked apply and OK.

The autologon works as I want (and expect) it to first time of re-starting,
but fails to hold this as default for future restarts, unless I go and
re-tick the box in Tweak UI.

Incidentally, it makes no difference if I uncheck the box on User Accounts.

This still happens after hard disc re-format and re-install of Tweak UI.

Can anyone assist please on how to make this work the way I want ? With
thanks.