Thank you ... I've just logged in for the day and seen your last message.
Since the password ***** disk has failed, the possibilities are limited.
I assume that there is no other user on the system with Administrator privileges who can reset the password. If there is, that is the best available option. If not, the simple options are gone and the possibilities down to two.
Before we going down the hard and dangerous path -- forcing a password ***** -- (a) do you have a recent full backup of the system when the account password ***** known, and (b) would it be a solution if you restored such a backup despite the fact that some recent changes would be lost? If so, I recommend doing a safety backup of the drive as it stands now, then restoring the system from the last full backup, then restoring any missing files from the safety backup.
If this is not a possibility, continue below.
The remaining possibility is forcing a password ***** This is both difficult and dangerous.
If there are any Windows encrypted files on the system (you will know this if there are, the encryption must be applied manually and it is not a forgettable operation), then resetting the password ***** render those files forever unrecoverable.
If there are no Windows encrypted files on the system, then a password ***** is an option. This used to be much simpler but with the recent Microsoft requirements for all PCs to have UEFI hardware, I no longer think it can be done by anyone except a trained PC technician who has done it before.
Fortunately, it is not an expensive operation if you have it done at a locally owned PC shop. The usual charge is $25 to $35 on a carry-in basis. I say "locally owned" because it is about 1/4 the cost of a chain store such as Best Buy, it gets done immediately rather than in two weeks, and it eliminates "Peek Squad" issues.
I do have instructions on how to do this for Windows 7 systems if you are an experienced PC hardware hobbyist, but they are complicated and must be done precisely without error
. For Windows 8 systems, I think it is no longer possible for consumers no matter how experienced.
When the problem has been resolved and the locked account is able to log in again, I highly recommend enabling the normally-disabled "Administrator" account or adding a second account with Administrator privileges. Lost passwords are only one of the problems that are much easier to solve if a second privileged account is available.
To enable the "Administrator" account under Vista or Windows 7, see the link below:http://www.howtogeek.com/howto/windows-vista/enable-the-hidden-administrator-account-on-windows-vista/
I am going to mark this as the official Answer but don't Rate it until you are satisfied that your questions have been answered satisfactorily. Don't hesitate to ask any further questions you may have.