Win7 Activation after not genuine notice

Hi!
I have windows 7 ultimate installed, I had used an activator tht time to activate, the updates had worked fine, but now, it got my windows, and on bottom right the message comes: This copy of windows is not genuine, pls help, now wht should i do? should i use a WAT remover, which i do not know what is it or use some activator. pls save my from reinstalling again.
Answer #1
use the WAT remover and then apply OEM crack over it
Answer #2

http://www.google.com?t=7262175&highlight=

Answer #3
Use Remove WAT and Remove Watermark !! Get it from here:
http://www.google.com?t=4738087&highlight=
Answer #4
Use RemoveWAT,
http://www.google.com?t=4434868
Answer #5
dear all!
Thanks alot for ur valued time, i used toolkit to remove water mark, then i used WAT remover 2.2.6 to remove WAT. Now should i use an activator too, or i can install updates now?
Answer #6
Yes you can update…but before you update…READ THIS !!!

FOR MORE INFO…SEE MY SIGNATURE !
Answer #7
@ALL thanks very much, to help me out, wish u best luck.