The old school saying "Two is better than one" is not so prevalent in the security realm when it comes to anti-viruses. Real time scanning or on access scanning finds viruses when they are opened. This means that the files are scanned when you open them. This usually happens so fast you don't notice. As for having two real time scanners enabled at the same time, they both try to jump on the file and can cause loops, which cause system slowdowns. Anti-virus programs traditionally use a lot of system resources when scanning or updating. Your computer may be running slow due to the fact that you have 2 or more Anti-Viruses running. Your risk of infection sky rockets when you put two Anti-Viruses on your PC. Think of it like condoms, you don't double-up on condoms because you have a higher risk of tearing them both. Yeah I know I just compared babies to a computer virus, forgive me.
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