Two nights ago my brother touched my Microsoft Wireless Keyboard 1000 and BAM the key mappings completely messed themselves up. The space bar was typing ‘G’ and Backspace became ‘R’ and ‘d’ was ‘/’ and so on. Every key was typing the wrong key (or modifier, leading to several accidental browser window closures).
Much online advice is centred around going to Regional and Language Settings to check that the correct keyboard is selected, but in my case the solution was much simpler: after fiddling around for a while and considering replacing the battery, I paired the keyboard with the base station again and everything was good. It’s an obvious solution, really, and I felt a bit sheepish afterwards for not having realized earlier.
Exact instructions vary, but usually you press a button on the base station followed by a button on the keyboard. In my case the button lives on the back of the keyboard – it’s an unassuming little grey push-button.