Any have experience with "unmountable boot volume"? [View all]

I lost 2 laptops to that in 2 weeks. The first was a Windows 10 that I took in to the computer shop and charged $65 to be told it needs a new hard drive at a cost of around $100. That's a nonstarter for a $300 laptop that's 4 years old.

Two weeks later my 5 year old Windows 7 laptop displayed the Blue Screen of Death with the same message: Unmountable Boot Volume.
Since I already knew the deal with that I didn't go any further. But it makes me wonder if I had gotten a virus or something to lose 2 laptops in 2 weeks to the same thing even though I used Avast antivirus in both, one being the paid version.

I have since left Windows behind and for less money I've got a Chromebook that meets all of my needs.