sometime you may require to know the OS installation date by which you can know how old is your operating systems.You can find this without any software.Not only the date of OS installation, you can also know the BIOS version of your system, Computer model name, Product code, Time and date of system startup etc.
Just follow the steps:

• Open command prompt window by going to Run and type cmd press Enter

• Write systeminfo hit the enter button

It will look up for system information and load the result below the input.


Now find the OS installation date.You can also view BIOS version of your system, Computer model name, Product code, Time and date of system startup etc.