Sounds like spyware to me. MSN Plus is not a Microsoft
product but looks like a 3rd party application.
http://www.msgplus.net/
I just used google to find that web site.
What you need to do is try Ad-Aware and/or Spybot. Copy
and paste these:
http://www.lavasoftusa.com/software/adaware/
There should be a link on the right side for download.com
or from their own site.
http://www.safer-networking.org/en/download/index.html
Link for dowloading is at the bottom of the page. Both
are free and make sure you update them after you install
them. Its best to run them in safe mode since any files
that would be running in the background thats spyware
won't be since your in safe mode.
Word of warning, it is POSSIBLE that by running Ad-Aware
or Spybot that some programs MIGHT NOT run after using
them, such as MSN Plus, search bars, etc. Use at your own
risk.
I use both and have no problems with either. You might
also consider running an virus check too. Try this:
http://housecall.trendmicro.com/housecall/start_corp.asp