What program did you use to make the backup image? ISO is an unusual format.
We can help you reimage and optimize your new computer so that it's much better than a new computer and maybe even the old one.
If you don't use the laptop for heavy tasks like video editing, there are great new deals every Sunday at Best Buy, Staples and Office Depot for solid laptops in the $350 range for dual-core, 3-4gb RAM, 500gb HD, and another $50-100 for Core Ix. I could do multi-tasking with a dozen windows open on one of these and make it last ten years running as fast as any $1500+ Apple. So you don't need to spend a lot.