Help !!!!!!!!!!!

My three year old Gateway desktop suffered a major failure and I had
to replace it with a new HP a720n. I 'm pretty sure the data on the
hard drive on the old machine is still good and I really really need
to recover that data.

My first thought was to simply install the old HD in the new machine
but theres apparently no way to install a second HD in the new a720n.

Anyone have any ideas as to how I can get the data off the old HD
?????

Thanks