OK. That is an Installation DVD. and a retail version of Win 7 product key.
But you still have one insurmountable problem..... a valid product key.
The rule is .......one product key, one install.
I am assuming that you did not uninstall Win 7 before the computer died..........
Although your Dell has " died ", as far as Microsoft is concerned, the Win 7 product key is still considered installed.
Therefore you cannot use the key again. If you do, you will get the error message such as " product key is in use ", and you won't be able to activate the new install.
You can try calling Microsoft and explain the situation. They might issue you a new product key.........IF you are lucky.
Otherwise, you are stuck with buying a new license.