Hello and welcome tongbram Mate I am not trying to be funny but I cannot quite get what is wrong.
Maybe you could set out your problem in point form
For example
1.Installed Windows 7
2. will not update
3. now says not genuine version etc etc
Just tell us what you did with the install and or what is wrong with it in that fashion.
Some system specifications would be very handy too ie the machine model and number