lappytech Back up your HDD now.
It sounds like HD failure is imminent. It may be working fine for now, but will unexpectedly crash. Most PC manufacturers have a diagnostics tool you can run to perform a thorough diagnostics check on the HD. You can access the diagnostics in "Set Up"by tapping F2 or F12? on boot up; click on "Run Diagnostics"
If you know the manufacturer of the HD, you can go to their web site and download their HD diag. tool. Western Digital have an excellent download diag. tool, "Data Lifeguard for Windows"