Gem Error

I have been struggling with this problem for a couple days now and any
help is greatly appreciated. I get an error when I try and update my
gems and now my existing plugins aren't even working. I am running
windows with instantrails 2.0, rails 2.1, and gems 1.2:

ERROR: While executing gem ... (Gem::Installer::ExtensionBuildError)
       ERROR: Failed to build gem native extension.

C:/InstantRails-2.0-win/ruby/bin/ruby.exe extconf.rb update

I am somewhat new to rails, does anyone know what this means?

I have been struggling with this problem for a couple days now and any
help is greatly appreciated. I get an error when I try and update my
gems and now my existing plugins aren't even working. I am running
windows with instantrails 2.0, rails 2.1, and gems 1.2:

ERROR: While executing gem ... (Gem::Installer::ExtensionBuildError)
      ERROR: Failed to build gem native extension.

C:/InstantRails-2.0-win/ruby/bin/ruby.exe extconf.rb update

It means it couldn't compile the extension a gem contained. If you
don't have a compiler ruby can use then you need to pick the mswin
version of gems when one is available.

Fred

This all happened when I tried to install the will_paginate as a gem.
Then I uninstalled it but still get this error. Do you have any idea
if there is something more I can remove to correct this?