Keyboard mis-mapping at Domain login

XP Pro - SP2
Dell Optiplex GX260
Plain Jane PS2 Dell keyboard.
Active Directory 2003
Standard 101/102-key or Microsoft Natural PS/2 keyboard driver Provided by
Microsoft, date=7/1/2001. Version 5.1.2600.1106

When logging into my PC or unlocking my PC (Same dialoge box) My keys seem
to be re-mapped. Not every key, just enough to be really annoying. After I've
logged in, I no longer have the problem. All the keys work great.

The problem is solved by rebooting the computer. It will go away for days,
weeks, months until something triggers the issue again.

I run tons of programs (Outlook, Notes, iTunes, Paint Shop Pro, ADUC,
Exchange Admin, MS Explorer, Internet Explorer, Process Explorer, LDAP
Browser, MS-Dos, and Visual Studio 2005 right now). Rebooting is a 20 minute
effort. I'd love to know if there's a way to reset the keyboard without
rebooting.