Did you already try another keyboard?
Somehow my sticky keys got engaged and I haven't been able to disengage. Shift keys held down, removing the check marks in the accessibility mode and re-starting, nothing is working. I have XP and amat a loss. It is still typing in mostly uppercase, highlighting when not wanted, etc. Even went to restore but it would not click on the last bold date. If someone hasbeen thru this before please respond, thanks