Error: This copy of Windows is not genuine.You may be the victim of software counterfeiting

Follow the steps below to resolve the problem:
Boot the computer in Safe Mode and logon as Administrator.
Browse through following location:
C:\Windows\system32
C:\Windows\system32\dllcache
NOTE: Dllcache is hidden folder
Delete wgatray.exe
Click Start, Run and type regedit.exe.
Locate the following path:HKLM\Software\Microsoft\WindowsNT\CurrentVersion\winlogonotify
Delete the key 'WGALOGON'
Close Registry Editor.
Restart the computer.
If not Resolve go to the below link
http://support.microsoft.com/kb/921914