can i use my windows 7 license from my windows computer?

No. That would be illegal according to your Windows software license.

The install disks you were given only have drivers for the old hardware. You need something with ALL device drivers.

Either buy full-install version or a "system builder" that is the same as OEM (1 install only but you can talk MS out of it) but has all device drivers.

Sneaky devil. You deleted the first sentence. 😁

You assume there was a "first sentence" to be deleted. Perhaps it is your imagination. 😉

It's those nasty notifications. The first sentence was in my notification, but then in the topic it had been erased.

If find that a nifty feature where you can first make a post then have the entire topic removed. Your post does disappear, but the notification still goes out. 😉