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People who complain they can't use MSN properly, or other connection issues have Zone Alarm installed.
People shouldn't be allowed to use firewall products unless they understand what a firewall is, how it works, and how to configure it manually.
That said, I have always used, and always recommend, Windows own firewall, Microsoft Defender for spyware (free download), and AVG anti-virus, also a free download.
Here's the links:
Windows Defender:
[microsoft.com...]
AVG Anti-Virus:
[free.grisoft.com...]
Hope that helps!