Error: 0xC004F050 The Software Licensing Service reported that the product key is invalid
Microsoft Office 2010 keys cannot be installed with the slmgr.vbs script, instead you must use the Microsoft Office 2010 KMS Host License Pack. This is available from the following download link:
Run the wizard and enter the Office 2010 KMS product key when requested. No other activation commands are required from slmgr.