I have Comcast internet, my roommates PC (with viruses) runs at the speed of light while my iMac struggles. My iMac worked fine on other internet connections before we got our own internet. I've reset the modem, cleaned my Mac, still nothing helps!

Question

As my title states, the PC works super fast and mine struggles.  We have $75 internet which goes to say that our internet is mega fast.  Before we got our personal modem, we were sniping other peoples internet in our apartment complex.  Even with a few bars of internet from AirPort, it was going faster than our internet now.  I've reset the modem, I've inserted DNS's, I've cleaned my Mac, everything I can think of.  I need help.  I called Comcast and they said it was my iMac.  I just bought this iMac in October.  It's still new to me.  Comcast says it's my iMac but I do not believe them.  My iMac runs fast, until I try to use the internet, so I know it's somehting with the internet.  Please help, it's making me regret spending $1300 on a computer

Answer 1

I have asked a moderator to provide assistance, they will post an invite on this thread.
Once you get a reply, if you click on their name, you will see a screen like this. Click on the link as shown below.
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There are some useful help pages here, for BT Broadband customers only, on my personal website.
BT Broadband customers - help with broadband, WiFi, networking, e-mail and phones.