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I'm having a problem installing MS SQL Server 2008 Developer edition on a Vista Ultimate 64 Bit machine. No matter what I try:

  • I uninstalled the previous installation;
  • I deleted all folders that where installed and had to do with SQL Server 2008;
  • I cleared my registry using ccleaner;
  • I tried 'fixit' utility from Microsoft uninstalling left overs;

It just keeps failing at installing setup support files with this error message:

SQL Server Setup failure

SQL Server Setup has encountered the following error:
Unknown property.

[OK]

I'm totally out of ideas. Any one has a suggestion for me to look at?

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To determine the cause of error messages like these, it can be helpful to record every action an application performs, using Process Monitor. This article is an example of how it can be applied. – Oliver Salzburg Feb 4 at 16:01
the setup already records everything to a log file. I can't make up anything out of it. But i did give it a shot, that PM software eats my memory totally out. – Yustme Feb 4 at 19:06
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migrated from serverfault.com Feb 4 at 14:48

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2 Answers

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Check registry branch HKEY_CLASSES_ROOT\Installer\Products\ and remove any SQL Server related entries (e.g. D30CF9A3586C138449FCE4FD3D474979) if exists.

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I have removed some of those product codes a few weeks back. I couldn't find this one in the register. But i did found some SQL Server related stuff. Thought i removed them all. But it still gives me that unknown property error :( – Yustme Feb 4 at 12:35
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up vote 0 down vote accepted

I just installed sql server 2012. That went flawless. Problem solved.

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