My Gateway notebook does the same thing. However, I find if I pull the USB plug out when I power up, it will startup normally. Once you get to the Welcome screen you can plug it back in.
I have sent it to Gateway for repair and they say they just reset the CMOS but it still happens when at home. I'm guessing they can't repeat the problem there because there is nothing plugged into the USB port when I send it in.
This popped up after upgrading to SP2 and installing the newest version 2005 of Norton. Could they be doing it? I have no idea and I'm too lazy to troubleshoot now that I know all I have to do is unplug the USB on intial startup.
My USB plug goes to a USB hub with a scanner, a printer, a memory card reader and a zip drive plugged in. Maybe my laptop doesn't have the huevos to boot all those devices so thats why it stops.
Anyway, give that a shot on your laptop if you have USB devices plugged into it.
The only thing I have plugged into the USB port right now is a mouse. I'll try removing that to see if it makes any difference.