Not sure what I have!

So a few days ago I logged into Yahoo messenger and never logged out. I never use it and just wanted to find a friend's info. I have a cable modem, so I'm always "online". So yesterday I go to the computer and I have a bunch of random IM's that just way BUZZ! On them...weird. Since then I've been having issues going to any website. It says page can not be displayed and I have to keep hitting refresh or chosing that favorite place to get it to FINALLY go. MSN is the hardest. I noticed that my McAfee virus scan was off and I NEVER turn it off. SO I went and downloaded every McAfee product (I have Comcast so they are free) and also ran Adware. It found 200 something things and I removed them. I've rebooted, I have TWO firewalls running, spyware, Virus protection, everthing! I looked for new Window's updates...I'm at a loss. When I do finally get into MSN for email for example, I have to click on the email 10x before it finally registers to actually open the email.

SO is it a coincidence that I received the those weird IM's and something is wrong with my internet connection or computer, or did someone snake their way in???