Taken from a thread of people having same issue, guy said this works
try using
http://www.askvg.com/remove-product-key-of-microsoft-office-xp-2003-2007-and-2010-using-office-key-remover/ (this is not anything illegal) and then try installing office
/e note, these are the posters words not mine. If there is any issue posting this, please let me know and I will edit it out.
Another suggestion,
I may be able to help with those of you who are unable to delete [HKEY_LOCAL_MACHINE\Software\Microsoft\Office]. The reason you are unable to delete it is because registry keys are subject to permissions . Permissions are security policy settings that restrict users from certain operations.
NOTE: Backup your registry or create a System Restore Point before proceeding further
Open Registry Editor (regedit.exe ) and navigate to the HKEY_LOCAL_MACHINE\Software\Microsoft\Office key and right-click Office and select Permissions
A Security tab will open with a list of users or groups who have been specified access privileges. Without writing a dissertation on permissions, I will attempt to make this easy.
Our goal here is to delete the Office key, so we need to grant YOU (your user name ) Full Control
This is simple if the checkboxes are not disabled, which they are so here is how you break the inherited permissions:
Click the line containing your user name and click the Advanced button. At the bottom of the new window will be a checkbox Include inheritable permissions from this object's parent . Clear the checkbox. It will ask you if you are sure you want to remove inheritable permissions, choose yes and replace the inherited permissions with explicit permissions because the key will be deleted after we are done.
It may take a few seconds to process the permissions, then click OK to return to the Security tab and checkmark the box Full Control and Allow then click OK to return to the main Registry Editor window. Then you will be able to delete the Office key.
My hypothesis is that this process will allow you to reinstall your copy of OFFICE, if you still desire to do so.
Good luck and let me know if this works for you or if you have found another solution to your problem
This post was edited by Fatal_Aquaintnc on May 6 2016 05:47pm