well as u know,the vista and win7 both has retail version,n it is 30days trial...for which lots of cracks n activators are available. i just want to know,i am trying dual boot,having win7 on C n vista on D partition,n both are activated by crack...but problem is,as long win7 is only OS,its activated but as long i install vista on D n apply crack,vista gets cracked but win7 on C again reverts to 30day trial. as i felt,this might be cause of installing win7 on C n vista on D,i mean oldest OS must be 1st,i dun know i m saying right or wrong.please tell me some solution,i will be very thankful. (just to tell u,both cracks work fine,as in single OS cracks works fine,just in dual boot it makes problem.).