read the fourm rules carefully before asking question. contact brand Custamer care or retailer for this problem. or check u r laptop for any ms sticker with product version and key. that key help u to solve the isseus.
Flip the laptop upside down, there will be a key
if the Key is not the same version as the windows you have installed then you need to contact the person who either installed or upgraded the software
If there is no key, purchase new Windows package, install key or reload the OS