Did you ever seen this one on your screen before..?? There is a simple explanation about it : Windows Genuine Advantage (WGA) is an anti-piracy system created by Microsoft that enforces Microsoft Windows online validation of the authenticity of several recent Microsoft operating systems when accessing several Microsoft Windows services, such as Windows Update, and downloading from the Microsoft Download Center. So if you get this screen it means that your Windows is not a genuine form from Microsoft, and you may be a victim of software caunterfeiting. It will be quite bothering if every time you turn on you pc and this things appears (based on experience), but of course we can remove it, here is one of the tricks :

1. Open your Task Manager by pressing Ctrl+Alt+Del at the same time
2. shut down “wgatray.exe”
3. Restart/reboot your computer and safe mode when you log in
4. Open your Registry editor
5. Find HKEY_LOCAL_MACHINE\SOFTWARE\microsoft\windowsNT\CurrentVersion\WinlogonNotify, Delete “WINLOGON” folder
6. Restart your computer