At home, I personally recommend using Avast! or AVG. Both programs are free. They do a great job of protecting your computer without using a lot of system resources.
On some older computers, manufacturers sold systems with barely enough memory to run, 256 MB with Windows XP. Some get so slow that you can get a cup of coffee while waiting for a program to load. Besided needing more memory, the real slowdown is either virus/malware or Norton or McAfee Anti-Virus. Both programs use a lot of system resources.
I would also suggest adding another freeware program, Spybot Search & Destroy. It is great at removing malware/spyware. It often will list many cookies as possible problems. You can delete them if you like, but they are not usually much of a problem.
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