After you removed pest Patrol, did you make sure to reboot and delete the remnants?

If not, it could have remained active and damaged your brand new install as it
was in progress. In any case, you should completely delete the damaged
BearShare folder before trying again. Sometimes installing over top of an
existing folder fails to replace damaged files, particularly if the damaged files
look newer to the installer program or if a buggy security program is still active
and interfering.

Another fellow came to Technutopia yesterday and succeeded with this same
problem, so it is possible.

Don't forget to uninstall that AOL Security Center and reboot if you didn't do
that yet. It has been identified as a likely culprit too.