Having successfully downloaded and installed C# Express and
Web Dev Express (to include .NET Framework 2.0 and SQL Express 2005,
I tried to download the SS Express Manager CTP. I successfully downloaded and installed on my Windows 2000 SP4 machine
the new MS Installer, as indicated on the web site and seemed to have
no problems with that.
The pre-requisites from the website were ("You must install the
Microsoft .NET Framework 2.0 and Microsoft MSXML 6.0 Parser before
you install SSMSE. Note The .NET Framework 2.0 and MSXML 6.0 Parser
might be already installed if the computer is running SQL Server 2005
Express. "): 1. New MS Installer - check 2. New Framework 2.0 (unless already have SQL Express) - check 3. New XML Parser (unless already have SQL Express) - check On attmpting to install, following a 30 second delay, a message box
pops up saying: "The Windows Installer Service could not be accessed.
This can occur if you are running Windows in Safe mode or if the
Windows Installer is not correctly installed.
Contact your support personnel for technical assistance." I am my "support person" and I have not the foggiest idea of where to
take this next. Any help would be most appreciated. The Windows Installer I downloaded from the CTP site is: WindowsInstaller-KB884016-v2-x86.exe The CTP file is: SQLServer2005_SSMSEE.msi
Unable to Install Sql Server Express Manager
Hope this forum has an answer.

Unable to Install Sql Server Express Manager
Michael Bartlett
However, I found the answer on techguy support:
Unregister and re-register the Windows Installer
Once I performed these two steps, I had Windows Installer back up and running and all else ensued as expected.
Perhaps the SQL 2005 Express folks could pass this on to others who might encounter the same issue. Probably a feature rather than a bug!
mexmsdn
It does look like the problem was with Windows Installer and not the SSMS-EE installation package. I'm glad you got it installed!
Dan
aghoneim
Second, You can also try searching http://support.microsoft.com for the error message you're getting from Windows Installer.
Dan