X-Post - Computer adds "1" or "!" when typing

This is a X-Post to the Software forum.........

Lately my computer has been throwing random 1's or !'s when I type. FYI - I have a laptop and am using a full sized wireless keyboard plugged into a USB port. My husband and I went out of town about 3 weeks back, taking the offending laptop with us, and returned last week, which is when I noticed this starting. I have reinstalled the keyboard driver, toggled the FN/Scroll lock key, rebooted, and still am having the problem. It's not major, just very annoying. And when I hold down the backspace key, it just adds multiple 1's until I let it up. Any ideas/suggestions? Could my keyboard be on it's last leg?? It is at least 5 years old............