Not Genuine...sometimes ...

I bought Win 7 Pro direct from Microsoft. I've been running it ever since without a problem until about three months ago. Now every so often (theres no pattern I can tell) I get the "not genuine" warning on the bottom right of my desktop. To remove it I right click "computer" in the start menu and click "properties" and the "not genuine" warning goes away. Here is the report Code: ---------...