How to fix Microsoft Update Error

I am trying to find an update from Microsoft Update web site when I got this error 0x80072efd. My operating system is Windows XP. The description in the error box says, My connection with the server could not be established. I tried resetting my modem and restart my computer, but it has no use.

An error has occurred
Code:
0x80072EFD
Description:
A connection with the server could not be established.
How can I fix this error and what is causing this to occur? Please help.
