Try it again and make sure you follow the below steps correctly
1 Add Network Service Account and give full Control permission to following folders
C:\Program Files\Common Files\Microsoft Shared*OfficeSoftwareProtectionPlatform* and C:Program data(hidden folder)*Microsoft*
Right Click on the folder OfficeSoftwareProtection Platform
from C:\Program Files\Common Files\Microsoft Shared and Microsoftfrom**C:Program data(hidden folder) Properties > Security > Edit > Add > Type Network Service > OK > Check the Full control box > Apply and OK.
- Add Network Service account and give full control permission to the registry entry HKEY_CALASSES_ROOT*AppID*
Go to HKEY_CLASSES_ROOT*AppID* registry >Right Click on the folder > Permissions > Add > TypeNETWORK SERVICE > OK > Check Full Control > Apply > OK
Now try re-installing the Office suite if it does not work.. dont waste your time, you need speak to someone to help you. Call Microsoft phone support at 1800-936-5700
Good Luck