For anyone experiencing the psp type A or type B message when connecting via USB, and it says it cannot find drivers.
The solution I have found to work well is to let the device wizard let you choose driver location, when you have selected that option get your computer to search:
C:\Windows\System32
And make sure to check the "search all subfolders" tab
This SHOULD get your computer to find the drivers needed, just repeat for as many things come up until it says device is ready to use.
This mainly seems to be an issue for Vista but if it helps anyone on XP then thats all well and good

Hi Tyrant. We got 3 new PSP 2003's slim and lites for the kids this xmas, running System software version 3.60. and hit the problem you described in getting the message PSP type A. Went thru your steps and still not working. Formatted the new Magic Gate 1.0Gb Pro Duo stick and turned the USB charging to off. Still dont know where to find the file to make the memory stick visible to the PC.
It could be as simple as the Windows Version being 98SE, if this is the problem can you let me know, and likewise if not the prob can you tell me where things are going wrong?