Installing VS.net

I had a trial copy of the VS.net DVD which I installed
on one machine and now I want to install it on another
m/c and I get the a message taht 'vs.net has already been
installed on maximum no of compuuters allowed'.Now the
trial period has already expired on the first m/c so why
can i not install on this one ?
Anyone know a way of getting around this? Or better do
they still send free copies of the VS.net ?

no name