I bought a PC from Dell a couple of years ago and it came with a Vista disc. Will this work with my new PC i'm planning to build, or will I have to buy Vista seperatly?
If it's a Dell DVD, then no, it will not work on your new computer. Even if it's a MS Vista DVD, you would still need the product key... and that product key will likely not activate on a non-Dell computer. You'll have to purchase a new copy of Windows.