I installed a fresh crossoffice, then internet explorer 6.0 thru the crossover install interface (including dcom95, outlook express and media player).
I went thru windows update by curiosity just after and could run the updates fine (all security patches, make 16 items).
After a simulated reboot seems 5 items are still detected by windows update as needing install.
IE works still fine, environnement doesn't seem garbaged.
Tchize