Word/Excel files not opening after last updates

Hello there,

On every workstation that runs Windows Xp professional with Service pack 2
and Office XP or Office 2003, after the last updates, released on October,
the following issue is happing:

1) If the user makes a double click on any DOC or XLS file, the
correspondent program doesn´t start.
2) If the user launchs the correspondent program, click FILE/OPEN e select
the desired file, no problem.
3) If the user leaves the WORD/EXCEL application opened and makes a double
click on a correspondent file, no problem.

Has anyone experienced this?

Thank you in advance

Wanderson R. - MCSA