Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
For the error "Office can't do that right now because your product is busy with another task" error when installing Office 2013 or Office 365" see:
http://support.microsoft.com/kb/2809219/en-us
See "General troubleshooting for installing Office 2013 and Office 365" at:
http://support.microsoft.com/kb/2822317/en-us
See ""Something went wrong" error when you install Office 2013 or Office 365" at:
http://support.microsoft.com/kb/2827031/en-us
and, if necessary http://support.microsoft.com/kb/2822317
If that does not help, then you might remove all traces of the Office installation by running the fixit from the following article:
http://support.microsoft.com/kb/2739501
and then reinstall Office by logging into www.office.com/myaccount with your registered email address and click Install Office.