Problem Reinstalling SQL Server Express 2008 under Windows 7

Dear SQL and Windows 7 People:

I have a system running Windows 7. It is not my main system, and
I have not installed much on it.

I installed SQL Server Express 2008 on it. I also installed SQL
Server Denali. The Denali installation ended up replacing my SSMS
with the Denali one. Because of some differences in the behaviour of
the SSMS, I wanted 2008's SSMS back.

I uninstalled both SQL Server versions and deleted all files in
the SQL Server directories in C:\Program Files and c:\Program Files
(x86). Not knowing what to do about any possible Registry trash, I
did nothing to the Registry.

I then installed SQL Server 2008 Express. The installation was
successful. Well, that is what I was told. There was no SSMS! I
have tried yet again (uninstall then install), and the same thing
happened again.

I could just nuke the box and restart, but I would rather avoid
something that extreme and time-consuming.

Is there anything I can do, or does this system get to be a
sacrificial goat to the evil god ReinstallFromOSOnUp?

Sincerely,

Gene Wirchenko