I never recommend using a pirate .iso that is on some forum.
Most computer manufacturers will send you replacement disks in most case for the cost of shipping.
There are some really wierd people out there who would love you to run the .iso that you downloaded and created the boot disk. This way they can install all the trojans and bot stuff on your computer as well as your bank account and credit card numbers.
Not trying to scare but beware of geeks bearing gifts.