Uninstall

Hello,
When I try to uninstall MightyMax2009 program I get a message that says insufficient acess contact system administrater. I cannot uninstall using normal methods, I installed this program for a free 2 week trial period and now cant uninstall and pop up keep interrupting me to purchase MightyMax2009 blocking a large amount of space.
This is very annoying and company who owns software tells me just as uninstall program to use which still says insufficient acess contact system administer