This copy of MS Office not activated

[chzuck]

A few years back I bought MS Office Professional Plus 2010 that came on a USB for two computers. I installed it on two computers and everything was working fine. Just last week I went to use Word on my one laptop and it said "This copy of Microsoft Office is not activated" I see error Code: 0x80070078 at the bottom of the popup window. Why did this change and how do I fix it?

[rollis13]

I would try to do a System Restore to an earlier point prior to the issue.