Does installing multiple antivirus programs on your PC enhance security? NO. Quite the contrary, if you install multiple antivirus programs on your PC, you’ll encounter more problems: Slowdowns, conflicts between antivirus programs, crashes and other problems more or less serious…
This also applies to firewalls: install only one!
Only one exception: antispyware programs (several antispyware programs does not destabilize the machine).
For a minimum-security: one antivirus software, with an antispyware and a firewall.
According to GFI, a provider of security softwares for networks, only one antivirus is not enough.
This is just an excuse to flog you more antivirus programs…