No problem. You may keep it. If anything, just uninstall Messenger Plus and then reinstall (making sure not to install the sponsor program).
Your log is clean. If you disabled System Restore, make sure to enable it now.
To help prevent future spyware installations/infections, please read the Anti-Spyware Tutorial (
http://www.greyknight17.com/spyware.htm#prevent) and use the tools provided.
Are there any problems now? If not, you should be set to go.