RSAT gone RSPLAT on your Vista box?
Ned Pyle posted a "unsupported" fix, on the Directory Services Team Blog, for a problem many are having after installing RSAT on a Vista machine. The problem results in missing tabs on the ADUC (Active Directory Users and Computers) dialog panels. If you happened to have installed RSAT on a Vista box and noticed some missing tabs (four in particular, which are named on the blog post), you should give this workaround a try. It works as far as I've tried and no serious side effects that I've encountered. A big shout out to Brian McCann for posting this also.