There is an issue with Drupal 6.4 and I've traced this issue back to Drupal 5.x also.

A user registers a new account. When an admin visits admin/user/user and decides to block this user (or carry out any action) this enables the "last access" column and starts counting as if this user accessed the site.

Clearly a bug. Setting to 7.x but the fix needs to be backport this to D6 and D5.

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Anonymous (not verified) CreditAttribution: Anonymous commented
Status: Active » Closed (duplicate)

this is a duplicate of #171117: Regression: users without administer users permission can not access user profiles of users that never logged in , marking as such.