Bob,
I am having the same problem as described above, raised as a result of a side by side installation (v23.1 was installed at the time I installed 2010). I have tried uninstalling v23.1 and reinstalling 2010 so as to make sure there would not be issues on that respect, as well as cleaning the registry, but it is a no go. The existing hotfixes do not help, on my particular case. Regall.bat fails to register most components so that is not a valid solution or workaround, either. I have followed the manual and made sure I was running the installation and assorted procedures with elevated user priviledges.
I have been tempted to just skip upgrading to 2010 at all, and discussed this matter at the other official discussion group, but the only valid solution appears to be to reach support. Do you reckon I should follow that road? Would there be any recommended procedures to manually clean the registry or program folders so as to start a fresh installation?
Thanks.