Useless logon dialog after system goes to Standby

After a clean reinstall - during which I (probably unneccessarily, since I'm the only user) entered a password, I got irritated with having to go through the Windows welcome screen to log on as myself (no password required - and I'm 'administrator', anyway, it says - or is that just adminitrator privileges?), I did a run, enter control userpasswords2 thingy, so now I come straight in on startup without having to do anything. However, the computer goes to standby after a period, and when I come back to it and briefly hit the power button to bring it out of standby - it produces a dialog box with my name in it and a password space. I will deal with the standby issue by fiddling with the 'power' thing in control panel, probably... but...

Never mind the fact that the password I entered during the reinstallation process is counted as 'wrong' - I discovered I can simply get over that problem (after 5 minutes of panic!) by hitting enter with the password space blank!!

Never mind, but how can I get that dialog box to vanish for good? (And, anyway, as an academic issue, why does the password I entered on reinstallation not work there?)

I'm running Windows XP Pro SP2.

 

Alternatively, you can just right click anywhere on your desktop, click on properties, then screensaver tab. Then click on power, advanced, and uncheck prompt for password, but, if this is a desktop, why do you have it going into standby? Just wondering.