Nah, I'm too cheap to pay a subscription so I use CA Security Center which comes free from Time Warner. My wife has the same laptop that we bought at the same time and she says she doesn't have this problem. I have very little loaded on this computer as I am trying to use it for just my business purposes.
Rob; Unfortunately, CA is the "bottom feeder" of the computer world. They purchase mature products and then market the h_ll out of them to companies as software packages. But they don't upgrade the programs to keep them current.
The problem may be that your machine's network settings are misconfigured. The problem you are having sounds like an IP Address conflict.
This will cause your computer to freeze for 30 seconds or so every 5 minutes or so.
The suggestion to check the wireless connection is a good one. If you have not already, make sure you have WPA (?) security enabled. This prevents others from using your internet connection.
To check for viruses, go to the Mcafee web site and use their free scanner tool. To check for Spyware or Adware, download the latest AdAware FREE! program and run it several times on your machine. I have used both of these products and they are excellent.
Mcafee:
http://www.mcafee.com/us/
Adaware:
http://www.lavasoft.com/
PS. I started in computers before there was an IBM PC! Before I retired, I worked in Network Administration and Network Security. Paranoia is a job skill / requirement for this position!
My system Setup:
1. Zonealarm to keep the nasties off my machine.
2. Turn off the Windows auto update and update my machine manually. Some updates will break other software. I snapshot my hard drive before making any major changes.
3. Firefox is my web browser, and Thunderbird is my email client. I do not use either Internet Explorer or Outlook. Either of these programs is like wearing a sign that says "KICK ME!"