I have Windows Vista Ultimate. For some reason right-clicking Computer has no effect, so how do I enter the product key?
Well, that’s a weird one. I assume you can right-click other things?
Well, there’s another path to open the System control panel:
1. Click Start, and then click Control Panel.
2. Click System And Maintenance.
3. Click System.
Now, you can access the Windows Activation settings at the bottom of the page.