My i5-2500k just turned 10 years old. It's a workhorse. HDDs are likely to fail first.
I haven't even replaced the battery in my 12 year old machine.
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you dont.
My Dell PC is going on 12 years old. It works perfectly, and I see no reason to even think about replacing it. Especially since, when I priced new computers a year or so ago, they were around a thousand dollars for the power and features I already have on the one I've got. I guess somewhere along the line, processing power stopped going up exponentially. True, my computer was a power machine when I bought it, and I've upgraded regularly, but you'd think the new PCs would have something to offer besides being able to play the latest video games. They don't.
I agree with the comments here. There is no reason to buy a new PC. You may want to consider wiping your hard drive and installing a fresh OS to remove all the malware or use BitBleach to clean up crap you don't need.
From time to time, changing your SSD may be a good idea, but that's about it.
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