Laptop Keyboard Prints Wrong Symbol?

I recently purchased a refurbished Sony Vaio PCG-6R3L with Windows 7.Everything was working fine, then I plugged in the USB plug for my wireless keyboard/mouse (Microsoft wireless optical desktop receiver 3.0A)I did not install anything for the keyboard, however windows automatically did something to get the keyboard to work (I think it downloaded the drivers automatically).From the wireless keyboard all the keys type exactly what they are supposed to, that's what I'm using to type this. I've used this keyboard on multiple computers, both with installing the software that came with it, and also just plugging it in, never caused this problem before.When I press and hold the FN key, all the keys type their regular symbol, however once I let go of the FN key they start printing the wrong symbol again.I did all kinds of searching online and went through all of the regional settings and such that I could find, and all the settings I could find were set to "united states english", which is also the only language/keyboard that I saw installed on the computer.