Mods this aint illegal stuff, read on lol

My pc i nicked off the olds and have just bought a new pc base unit.....

Now can i copy programs like office over???? was thinking of taking hd out of mine and slaving it on new one then copy from 1 to the other, can this be done??? Thing is i never nicked all software stuff lol and cant be arsed to drive over to get it but can obviously get the code over the phone.

Would just swap hd but olds want this back with some stuff still on that they loaded before i stole it.