Latitude D820 Keyboard mapping error

I have a Dell Latitude D 820 that was provided to me by my employer.  The problem I am having began about one week ago. 

Here is a synopsys:  When I depress the right arrow key, I get one of two results, neither one is the cursor moving to the right.  Either "/n" will be inserted into my document and the computer ALT-TABs to the previos document; or, "/b" is inserted into my document and the computer ALT-TABs to the previous document.  On a few occasions, while using MS Word 2003, the "/n" or "/b" was insterted into the document and one of the menus was pulled down.

I have not found any custom keyboard mapping assignments anywhere on the computer.  Additionally, as I'm usually a mac user; I am not overly familiar with the diagnostic programs and utilities. 

The only change made to the copmuter, which occured about the same time as the kleyboard mismap, was that I installed a HP printer.  The printer is a HP Color Laserjet 2600n.

I attempted adding a USB keyboard.  The external keyboard works normally, but the laptop's keyboard continues to malfunction.  This also malfunctions in Notepad.