Windows 2000 will not update!

This is the message I get from windows updates page.
“Files required to use Windows Update are no longer registered or installed on your computer. To continue:

Click option 1: Register or reinstall the files for me now (Recommended)
Click option 2: Let me read about more steps that might be required to solve the problem.”

Clicking option 1 makes out like it’s doing something useful, then goes back to the Windows Update screen offering Express (recommended) or Custom. Doesn’t matter which you select, it sends you back to:
“Files required to use Windows Update are no longer registered or installed on your computer. To continue:”

Clicking option 2 does not send you to a place that helps you resolve the problem, it sends you to a screen where you can “SEARCH FOR YOURSELF” from scratch!

Any help would be great. Thanks