I meant that neither SuperAntispyware free nor MalwareBytes free provide
real time protection because they don't scan files in real time...eg when
they are downloaded, opened, or closed. They are "on demand scanners".
These two programs target malware, adware and the like... not viruses.
I have no experience with Avira free but I thought it was an anti-virus
program. According to Avira free info page
http://www.free-av.com/en/products/1/avira_antivir_personal__free_antivirus.html:
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Avira AntiVir Personal - FREE Antivirus is a reliable free antivirus
solution, that constantly and rapidly scans your computer for malicious
programs such as viruses, Trojans, backdoor programs, hoaxes, worms, dialers
etc. Monitors every action executed by the user or the operating system and
reacts promptly when a malicious program is detected.
Avira AntiVir Personal is a comprehensive, easy to use antivirus program,
designed to offer reliable free of charge virus protection to home-users,
for personal use only, and is not for business or commercial use. Available
for Windows or UNIX.
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Regards