I just posted 1.8.1-13 Release Candidate 1 (RC1)for the Ruby Installer for
Windows. This should fix the problems with RDoc and RI. RC2 will fix the
reported win32ole problem, but I wanted to get this part out as soon as
possible. You can download it here:

  http://rubyforge.org/frs/?group_id=167

Please report any problems by creating a bug report (selecting the group
"181-13 Release Candidates") at:

  http://rubyforge.org/tracker/index.php?group_id=167&atid=715

Curt