lost the keyboard keys suddenly

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.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
w5nd6ws 7 6n f415ts4 35feb662 tab3et +)
windows 7 on fujitsu lifebook tablet ;)

i got l33t keyboard, now i must use onscreen keyboard. one finger typing is killing me.

i can only think of babylon translator
 

My Computer

OS
vista
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.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
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.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
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.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
If this is a laptop just look for and press the "fn" key.
 

My Computer

Computer type
PC/Desktop
OS
Windows 11 Workstation
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.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
Have a look for a num lock key.
 

My Computer

Computer type
PC/Desktop
OS
Windows 11 Workstation
I never heard of or seen the num key do this. Once again, z3r010 proves himself to be a super-genius.
 

My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
Toshiba P775-S7100
OS
Windows 7 Professional SP1 64-bit
CPU
Intel Core i5-2450M @2.5 GHz
Memory
6 GB DDR3 1333MHz
Graphics Card(s)
Intel HD 3000
Monitor(s) Displays
Built-in 17.3" LED; 22" Insignia NS-L22Q-10A
Screen Resolution
1600x900; 1360x768
Hard Drives
750 GB Hitachi
1TB Seagate FreeAgent External
Internet Speed
Verizon DSL Speed(Down/Up): 3360 Kbps / 800 Kbps
Antivirus
MSE and MBAM Pro
Browser
IE10
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