But I can't find my USB Drives

So - I was at a client this week.  New computer install.  Plugged in my portable USB powered drive into the front of the PC and the PC couldn't find drivers for the USB drive.  After some long searching (which included running sfc /scannow).  I ended up having to tell Windows to find the drivers at C:\i386 (several times).  Although, while on the way to finding the solution, I found this cool page that has a lot of USB drive troubleshooting tips on it.  http://www.techspot.com/vb/topic122125.html