MsiInstaller errors, things won't install. HELP!

Hi all,

Got Windows Server 2008 here, and having some major issues with the MsiInstaller. Basically, certain things are not able to finish their installation, e.g. the two examples I have which are causing me issues right now are my Anti-Spam updates which fail with a red event ID with MsiInstaller as the source, and most recently the attempted installation on SQL Server 2008 Express (a requirement for our Backup Exec installation).

Examples of the errors for the two issues are here:

Log Name: Application
Source: MsiInstaller
Event ID: 11719
Level: Error
User: Administrator

Product: Microsoft SQL Server 2008 Setup Support Files (English) -- Error 1719. The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if Windows Installer is not correctly installed. Contact your support personnel for assistance.

Log Name: Application
Source: MsiInstaller
Event ID: 11719
Level: Error
User: Administrator

Product: Microsoft Exchange 2007 Enterprise Anti-spam Filter Updates - Update 'Update to 3.3.7007.600' could not be installed. Error code 1603. Windows Installer can create logs to help troubleshoot issues with installing software packages. Use the following link for instructions on turning on logging support: http://go.microsoft.com/fwlink/?LinkId=23127

Log Name: Application
Source: MsiInstaller
Event ID: 1024
Level: Error
User: Administrator

Product: Microsoft Exchange 2007 Enterprise Anti-spam Filter Updates - Update 'Update to 3.3.7007.600' could not be installed. Error code 1603. Windows Installer can create logs to help troubleshoot issues with installing software packages. Use the following link for instructions on turning on logging support: http://go.microsoft.com/fwlink/?LinkId=23127

I have since been scouring the internet for clues on how to fix this. I've upgraded the MsiInstaller to 4.5 (as mentioned here: http://www.microsoft.com/DownLoads/details.aspx?familyid=5A58B56F-60B6-4412-95B9-54D056D6F9F4&displaylang=en) but that has failed to help, I've also tried de and re-registering via the cmd prompt to no avail.

I'm now so lost, and I'm wondering what else is going to start failing! We can't really go on much longer without the backup software installed and running, plus the anti-spam updates for Exchange 2007 need to be installed. Maybe I need to totally uninstall and re-install the MsiInstaller? I don't know! I need the help from a Server 2008 expert! :)

The server is Windows Server 2008, SP1, X64.

All help very much appreciated :)
Nicola_BourneAsked:
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ccnsCommented:
check services.msc and check all automatic services make sure they are running if not start ones related to this issue
Nicola_BourneAuthor Commented:
Should have mentioned, I've run through and checked all services are started / set to default recommended settings. They are all in an expected start, and e.g. Windows Installer is correctly pointing to c:\windows\system32\msiexec.exe /V

Nicola_BourneAuthor Commented:
Solution found:

Incorrect registry key at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\msiserver where we had a wow setting to 1 changing it to 0 resolved the issue.

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brian_davisCommented:
what setting needs to be chaged to 0? I'm having a very similar issue here.
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