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Losing important data from the hardware can usually be retrieved. It can be quite a difficult task, so it is advisable to use a professional for data recovery hardware.
If the files have been lost from the operating system, one can use the full length disc to repair any data lost. Most everyone should have a backup disc of programs that are on their computer, for cases such as these. You can also use online data recovery, if disc is not available. In this case, you would search for the program online to install in your computer.
If files are just deleted, do not panic. The files are not deleted from the hard drive immediately. More than likely, the reference to that source is just deleted and space is freed for new files. The original files can be restored.
In some cases, there may be physical damage, in which case a professional may be needed. This may require new components to be installed in your computer before any data can be restored. Also, if your computer is still under warranty, replacing parts inside the computer by anyone that is not qualified can void your warranty. So unless you know what you are doing, it is the best idea to seek a professional, plus you want to make sure to maintain your warranty.