No AV product will catch every virus every time. All of them will miss one
at odd, unpredicatable times. Much depends on the definition file in use,
frequncy of updates, user habits, and program configuration. To base an
assessment on one missed bug would be like not using windows because it it
crashed once (hint: linux crashes too).
As to the question, there is no "best" AV product. To me, the "best" one is
the one that the user is comfortable with and provides a reasonable ease of
updating and use without bogging down the system.
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Best of Luck,
Rick Rogers, aka "Nutcase" - Microsoft MVP
Associate Expert - WindowsXP Expert Zone
Windows help -
www.rickrogers.org