Did you reboot afterwards…?
:-[ no. I considered, but was in a rush. Hopefully that’s it (and the rest of these answers are irrelevant). I’ll be back to look at it this weekend.

Which firewall…? Windows
Other security related software…? No
OS…? XP SP3
Which avast…? free antivirus
Which version…? 6.0.x (whatever version downloaded on July 25)

Thanks!