Blue keys must mean you have a function button somewhere, so I'm guessing you activated the Function lock. What you need to do is deactivate the function lock. If you don't have a function lock, get your hand off the function button.
Maybe you have a 'blue button virus' imbedded in your keyboard?! LOL
No seriously... is there no instruction manual that came with the keyboard? You should be able to find out where that 'function button' is located, or... what the key combination is used to activate/deactivate it... tried to look it up in there yet?
...or just buy an external, full-sized keyboard xD
I did that for my lap-top. It's cheap and you can hit it when you get frustrated to relieve your anger. Pretty useful stuff, plus you get extra mobility.