Okay:
To not install it, simple select "I refuse to install the sponsor program" when installing Messenger Plus!, here is an image to show you how to do this:
Okay, to remove it:
Go to Start > Control Panel > Add/Remove Programs, go down to Messenger! Plus, press "Remove", then you can select, "Uninstall the sponsor software without uninstalling plus!" (or along those lines
). It will ask you to fill in a security code, do this, reboot your computer, and the adware will be gone
.