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It might be worth it to try a clean reinstall of Windows before investing a ton of $. I've been meaning to do that to my laptop (also runs Win 7), My original 5+ year old one one died so I bought the same model and just swapped drives and it carried over a lot of the same issues.
I wanted to buy a new hard drive before doing a clean install, just in case it goes wrong I can just plug the old one back in. Also shutting down mid use can be a overheating issue, at the start of the summer heat I had the same issue, but a desk fan pointed at my pc stopped it.
