Message: You are trying to use office but don't have office

[ABabeNChrist]

I just installed Office 2010 on a Windows 8 laptop. The Office works fine as it is; however, when I open my excel xlsm workbook, I receive a message “You are trying to use office but don't have office”, It further says either try, buy or activate office 365.
I then followed these steps to check if Office 2013/Office 365 is installed on the computer
Press the ‘Windows + R’ key on the keyboard.
In the ‘Run’ windows type ‘Control’ (Without the quotes) and click ‘Ok’.
Once you are in Control Panel, click on Program, Program and features and check if you find any other edition of Office installed on the computer apart from the one which you have purchased.

I could not find any file named Office 2013/Office 365, but did notice many Office files installed on a earlier date. I’m not sure which files I should remove/uninstall

[HansV]

Which Office components do you see in the Programs and Features control panel?

[ABabeNChrist]

I found the culprit, it was Microsoft Silverlight. As soon as I uninstalled file everything started working.

[HansV]

Good that you found it, but a weird culprit - Silverlight is not part of any Office version...