I recently installed windows 7 from a Preactivated multibrand DVD installer. At first, everything's fine,I can have windows update and it's showing i'm genuine. But after several days, It's now showing i only have 16 days left and activation is needed. I tried some product key i got from the net but nothing's working.All leads to an error in activation.I've searched but i can't understand what's SLIC and other stuffs. I'm on the verge of trying Daz's loader but there might be another cleaner way since my desktop is Acer veriton m261 so OEM activation might work. Anyone can help a noob like me? thanks!