There is no mention of this problem being fixed in the latest Version 5.1.889 2011-01-13. I have left my Dad's XP machine at 5.067 for now and will wait for at least 2 releases after that(so 1 more) before I consider updating his again. I would prefer he just stop using that machine all together as it is on it's last leg anyway!
Version 5.1.864
2010-12-31
boot-time scanner now available even in 64-bit Windows
big improvements in the Behavior Shield
improvements in the antirootkit engine
improvements in the cleaning module
stability/performance improvements in the Web Shield
CommunityIQ improvements
added support for sound packs
minor improvements in the user interface
minor fixes in the firewall