I installed McAfee Internet Security 2009 3-User on two home computers, both with Windows XP installed. One of the computers becomes very slow on its internet connection. I tried to turn off most of the firewall settings in the security center configuration, but nothing worked. I eventually uninstalled the software, and the internet speed becomes normal right after that. I am disappointed because it wasted a lot of my time.
Sorry for the Inconvenience caused to you but please clarify
What is the Operating system you use (Vista/Xp/2000...)? What type of internet connection you use (DLS/Cable/wireless)? Did you use any third party security software along with McAfee (Norton, AVG, etc… if you have uninstall from the add and remove program and try to install the McAfee