Can you save your PC..... that depends on how old it is and whether it is worth saving.
The problem could be as simple as replacing the CMOS battery or adjusting a loose cable..... or it could be terminal in that your HDD has gone to Hard Disk Heaven.
Suggest that the first thing to do is make sure that all the hardware is OK. Cables, HDD, overheating.... all the normal stuff.
If you are absolutely sure that the hardware is OK then a reinstall of Windows will probably fix the problem.
T.
The problem could be as simple as replacing the CMOS battery or adjusting a loose cable..... or it could be terminal in that your HDD has gone to Hard Disk Heaven.
Suggest that the first thing to do is make sure that all the hardware is OK. Cables, HDD, overheating.... all the normal stuff.
If you are absolutely sure that the hardware is OK then a reinstall of Windows will probably fix the problem.
T.