Skipping the logon screen on start up for a user

Using latest Windows XP Pro SP3 with all latest updates...

If there is a better forum for this question, please advise.

I use the PowerToy Tweak UI to skip the logon screen when you start windows

(it is a simple checkbox). It has worked fine in the past, but now the check

box unchecks it self every now and then, causing the logon screen to

reappear, and I cannot figure out why. I reinstalled the PowerToy, but that

did not correct the problem. The PowerToy URL is:

http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx

Any idea what the problem is? Is there another more dependable way to set

windows to skip the logon screen for a particlar user?

Thanks

Blb