Can't Uninstall Winzip

Hi,

I hope someone can help me out!

I'm having trouble uninstalling WinZip.

When I go to uninstall a program and click to uninstall Winzip I get the error message: The Windows Installer Service could not be accessed.

Someone suggested I try downloading Windows Installer from Microsoft but when I did so I got the error message that I did not have permission to update windows?

I'm on a home laptop - with no other users. What's going on? I tried uninstalling a different program and got the same error message.

I haven't made any recent changes to my computer (that I know of anyway lol)

How do I fix this?

Thanks :)