You've recently installed Microsoft Office but after entering the serial number and proceeding with the activation process via the Internet you get the error 0x80070190. I believe this means, you don't have Administrator privileges to perform the activation.
On Windows 7/8, right click on one of the Office apps e.g. Microsoft Word, Microsoft Excel, etc. and select "Run as adminstrator" -- this will take you back to the activation page so you can finish the activation process (via Internet).
