1. USB Keyboard support.
2. LEGACY USB settings.
Toggle them and retest.
There IS an issue if you load some older Logitech keyboard or mouse drivers. Here's the article about that -> http://www.jsifaq.com/SF/Tips/Tip.aspx?id=2623 *yes it works that way on XP too.
Be sure to use safe mode when you look at that one.
I am working on a friend's PC and have encountered a problem related to the mouse and Keyboard being inoperative in Windows.
The machine is a Dell E-310 with 3.0Ghz processor, 512 Meg RAM, XP Home and USB Keyboard and mouse.
The machine boots into Windows and reaches the login screen OK. However, the Mouse and Keyboard are completely inoperative leaving the system stuck at the login screen.
The Keyboard works fine when the machine is booted into the BIOS setup menu.
I also booted the machine using a Knoppix CD and both the Keyboard and Mouse work perfectly in Knoppix. This seems to rule out any hardware issues and points to Windows as the culprit. Dell did not provide a CD with the Windows installation disk so I am kind of stuck on the problem at this point. The machine is past its Dell warranty date.
I appreciate any advice and direction on what to try next.