You get an error message when trying to install Windows Updates on your Windows XP or Windows 2000 computer.
Problem: A problem on your computer is preventing updates from being downloaded or installed.
Here’s how to solve the problem:
1. Click Start > Run and type regsvr32 wuapi.dll
2. When you receive the message that the DLL has been registered, click OK and perform the same steps for each of the following commands under Start > Run: