The product key of my computer said is invalid-yfv3j-wvmfy-kxfkv-

[I cannot understand the display name]

I was trying to use a micro soft word, then it says i must type a product key
which i did then it says the product key is
incorrect(YFV3J-WVMFY-KXFKV-CQGWJ-G6VJK)

 

[Carey Frisch [MVP]]

Computer manufacturers often install a trial version of Microsoft Office.
If you are getting a prompt to type in a Product Key when opening a Microsoft
Office program, it s likely the trial period is over and you'll need to purchase a
license (product key) for Microsoft Office.

The product key affixed to your computer is for Windows Vista (the operating system)
and not for Microsoft Office. Please review the following:

How to determine whether you have a trial edition of a 2007 Office suite or program installed:
http://support.microsoft.com/kb/927920/en-us

How to convert a trial version of a 2007 Office suite or program to a full retail perpetual license version:
http://support.microsoft.com/kb/927756/en-us

How to buy the 2007 Microsoft Office suites:
http://office.microsoft.com/en-us/suites/FX101678741033.aspx?ofcresset=1