Your PC is telling you that your Hard drive is getting to the point ware it will not work.
I highly recommend that you get a new internal hard drive or a external hard drive at copy any data that you want to keep.
Hard drives can and do break over time due to use. The older the PC the more likely you are to have a failure of a part. If you PC really old (16-20 years) then get a whole new Computer. I did that when My own Hard drive failed on my PC.
this is the message I received when starting my computer this am.
Disk failure is eminent, please back up hard disk and have it replaced. What does this mean?