I had that happen with the "n" key on an older computer and it drove me nuts for a while. LOL
My laptop generates a 1 and inputs it on whatever is open it what appears to be a random occurence. It does not seem to be based on any particular program. I can be in mail, Excel, VB, Word or whereever and all of a sudden I have a 1 that is entered. Anyone have any ideas on this one?