I see you use two different disks for your two O.S.: Windows 7 and Leopard, isn't it?

I have 3 in my 160 GB disk and I notice something: the time in Mac and Windows changes when I boot to anyone of them. I think that when I load Mac, the Windows time freezes, and when I load Windows, the Mac time and date freezes xD
Does that happen to you?

And thanks for the info about the Update