Analyzing this from the following problems: 1. The computer cannot access to drive C:, First you have to use the available software to fix the hard drive. If it cannot be fixed by the software, then you have to change the hard drive. 2. The hard drive has some bad sectors and it does not make the computer work smoothly. 3. The computer's owner want to increase the capacity storage of the hard drive. You can view the capacity storage and price details by clicking the 'stores' on the above menu and select the 'hard drive'. All of them are available for sales online; read carefully before purchasing whether they are internal or external (portable) hard drive. Etc......
If the hard drive can be accessed, you have to transfer the data from the old hard drive to the new hard drive first and you don't have to re-install all the software, but if the hard drive cannot be accessed, after changing the new hard drive you have to re-install all software.
How to transfer the data between the old hard drive and new hard drive:-
The following free streaming videos are from www.youtube.com
How to change the hard drive:- The following free streaming videos are from www.youtube.com