Try the memory key on another XP computer.
Try another USB-device on this USB-port.
Post back what you find.
I read someone else who had a similar problem to me only their fix doesn't work for me.
I have a USB memory key (i-stick 2.0) that I've been using for quite some time. It appears that since I've installed SP2, whenever I plug it in one of two things happens.
1) I get a message saying that the hardware is not recognised
2) I get a blue screen with the 0x19 error (this is what usually happens).
I've checked high and low. I've looked as Microsoft Knowledge base and checked the internet, but no luck.
The USB key does not have it's own driver, it uses the Windows XP USB driver, so there's nothing to uninstall.
I've checked the manufacturers website to see if they have a solution, and I've even emailed them, but they haven't responded.
I've tried going into safe mode to see if it's any other startup program that could have caused the problem (because startup programs don't work in safe mode) and even in safe mode I get the blue screen.
Can anyone help me?