My laptop automatically installed KB952954, KB953838, and KB953839. After the forced reboot, I could not access another computer's shared disk area or printer.
Microsoft's help phone line had me remove KB953838, and reboot but that didn't help.
Lowering Zone Alarm's Internet Security Level to Med. (from High) worked around the problem.
Operating System:Windows XP Home Edition
Product Name:ZoneAlarm (Free)