no, there is no work around for that, it is illegle to use the same O/s on two computers.
I you sold the dell, the cd must go with it, as it is regestered to that one computer.
the cd is designed for that one computer and will not work on any other system.
you need to buy a new O/S to install it on the new laptop.
the new laptop should have came with a set of cd's designed for it.
bottom line is, you cannot do what your trying to do.