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Microsoft Office Products Software has to be REinstalled, when a new hard drive is used.
So, you need to get the Install Media that you used the FIRST time you installed MS office software.
Typically this is in the form of a DVD, but can also just be a download, or a .msi (microsoft install files) file.
Did YOU personally buy the software? Was it provided to you from your employer? Did the Office software come WITH the computer at the time you purchased the computer?