It is an emoticon for msn.
go yo control panel on your start button > select programs > go to add or remove programs > go to msn programs > you will find imbooster > remove imbooster from msn
Go to the control panel, remove or add programs and click remove to uninstall. Apart from that, you can also use the more reliable software option known as, the imbooster uninstaller.
If you're using Windows XP: 1. Go to the Control Panel > Add or Remove Programs. 2. Scroll down for Iminent and Remove it. If you're using Windows Vista or Windows 7: 1. Go to the Control Panel > Programs and Features. 2. Scroll down for Iminent and Remove it.