Iam Getting An Information That My Copy Of Windows Is Not Genuine Since 4 Months

Please follow the steps below which may fix the issue:

1. If there was a previous Hardware replacement (Motherboard, Hard Drive, Memory, etc.)
    then proceed to step 3.    

2. If you have reinstalled/upgraded to Windows 7 then would suggest you to reinstall windows  
    again.

3. Please update the latest BIOS of the computer.

Once you have updated the BIOS or in case you have the latest BIOS installed then try the steps below:

Click start=> on the search programs and files box, type Msconfig and hit enter. You would see a screen where we need to choose Services Tab, Tick the checkbox Hide all Microsoft Services. Click Apply and Ok. 

Click on start and type command (cmd) with run as administrator option or check how to open elevated command prompt               

Now type following command  

slmgr.vbs /rilc   

slmgr.vbs -ipk                         

To activate windows after changing the key, run 'slmgr.vbs -ato'              

Please reply if you have any further questions.