Windows explorer hangs

[Terence Chim]

The window explorer of my XP Professional hangs under the
following conditions:
(1) when the File of menu bar is clicked
(2) when right click on a folder
(3) when any detail item is selected and right clicked on
it.

The windows task manager shows that the relevant window
explorer process is not reponding.

I have used windows update to apply all available patches
but the problem still persists.

Could anyone advise how to fix the problem?

Thanks.

 

[Terence Chim]

After applying windows update one by one, I found that it was 821557 which
was causing the problem.