My CTRL (control) button on my keyboard seems to be not working, how can i fix it?

is there a virus that might have disabled it?My CTRL (control) button on my keyboard seems to be not working, how can i fix it?
U need to start from software 1st,recover or reformat yr system...But from exp,that's a hardware problem...Send it in a service center,change da keypad,which will cost abit or alternatively,which is cheaper,get a USB keyboard.My CTRL (control) button on my keyboard seems to be not working, how can i fix it?
I have the same prob, but not the CTRL key, my '; and @ key function are turned upside down!! When I type ';, it comes out @ ; when i type @, it comes out '; !!But sometimes it'll turn back, then go haywire, then turn back....