That's precisely the question many will have sooner or later. The following is seen at the Vista help section at Microsoft.
"
I think an update that I recently installed is causing a problem, but I'm not sure if I should remove it.
Because updates can enhance the security of your computer, it's best not to remove an update unless you're certain that it is causing a problem. Try to find information about any problems that have occurred on the computer by checking for a solution. For more information, see
Check for solutions to software problems. If no solutions are available, check the Windows Update history to learn more.
1. Open Windows Update by clicking the
Start button
, clicking
All Programs, and then clicking
Windows Update.
2. In the left pane, click
View update history.
3. To view more information about an update, double-click it.
You can also search online newsgroups or communities for more information about an update. Try the Windows Update discussion group on the
Microsoft Discussion Groups website.
If an update applies to security-related areas of the
operating system, you might not be able to remove it. If your computer is connected to a
network, contact your
system administrator or your company's technical support group before removing the update.
http://windowshelp.microsoft.com/Wi...9824-5cb5-493d-9151-9a97d0f565b61033.mspx#EZH
With XP you can simply go into the add/remove programs and check the show all updates option there. With Vista the Programs + Features now lacks the add/remove Windows components as well as showing the updates there.