Are you currently running the Windows 7 Release Candidate (RC)?
If you are, then from the 15th February (less than two weeks time) you will be advised that from March 1st your machine will begin experiencing bi-hourly shutdowns. These shutdowns will continue through June 1st, 2010.
On June 1st, 2010, a non-genuine experience is triggered where your wallpaper is removed and “This copy of Windows is not genuine” will be displayed in the lower right corner above the taskbar. This means your PC will no longer be able to obtain optional updates or downloads that require genuine Windows validation.
If you want to read more about this, you can check out the Microsoft KB article by clicking here.
So, if you are still using the RC of Windows 7, and you want to continue to use it, you have to go and buy a copy – what are you waiting for?

Oh crap! I thought on June 1st the bi-hourly shutdowns occurred… ACK!!!
Anyone have some cheap discounts on win7?
Maybe you should start charging for P80 🙂 (he says ducking behind something to avoid the rocks!)
Andrew