You aren't telling us much. It sounds like you might have a faulty keyboard or malware. Please fill out your system specs in your user control panel and tell us what antivirus/antimalware program you use.
I have no clue what you just said, at all. Other than I now know you have a Fujitsu. If English is not your first language, please tell me, as it might help me assist you better. Please tell me if you have any kind of antivirus software installed. If not, install malwarebytes anti-malware. After that has cleaned any viruses from your computer, you can install Microsoft Security Essentials, which will protect you from further infections.
By anti-malware, do you mean malwarebytes? Viruses are more than capable of slipping past one AV program. I have no clue about multilingual keyboard settings. If you are sure that malware is not the problem, then your built in keyboard has a hardware issue, and will need to be replaced. I recommend contacting Fujitsu about the issue. They may be willing to replace the keyboard for free or for a small fee.
There is no setting I know of that causes letter keys to create numbers instead. If you are using a translator software, maybe, but I highly doubt it. Malware and hardware problems are your best bets in this case by far.
Computer type PC/Desktop System Manufacturer/Model Number doofenshmirtz evil incorporated OS Windows 8.1 Pro CPU Intel Core i7-3970X Extreme Edition Motherboard ASRock X79 EXTREME11 Memory 32GB (8x4GB) Corsair DDR3 Dominator Platinum Graphics Card 2x 3GB EVGA GTX 660 Ti Superclocked+ Sound Card Creative Monitor(s) Displays 3 x27" Dell & 2 x 23" Dell Screen Resolution 3 @ 2560x1440 & 2 @ 1920x1080
Keyboard Microsoft Ergononic 7000 Mouse Logitech Performance MX PSU 1500W ThermalTake Toughpower Case Thermaltake Level 10 GT Cooling Antec Kúhler H2O 620 CPU Watercooler Hard Drives 240GB Intel 520 Series, 2.5" SSD, SATA III
Intel X25-M SSD - 160GB Internet Speed 34 Mb/s ADSL2+ (Bonded) Antivirus Windows Defender, Malwarebytes Pro Browser Firefox Other Info WinTV NovaTD
HP CP1515n Color Laser
Sony BD-5300S-0B Blu-ray Writer
Microsoft LifeCam Cinema
APC 750i Smart UPS
If this is a laptop just look for and press the "fn" key.
Every laptop I've used required the fn key to be held down, instead of just pressed once. Although depending on your settings, this may work. It never hurts to try at any rate. Also, the key may be stuck. Pull the key off if necessary (without breaking anything) to make sure the button below is not being pressed.