SQL 2008 R2 installation problems – install SQL server before .net 4.0!

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While trying to setup a clean development computer, I ran into all sorts of installation problems with SQL 2008 R2. “Invalid operation” and “System version=4.0.0.0” not found. After trying all sorts of install/uninstall combinations, I decided to format the disc, reinstall W7.

Seems like that did the trick and now I am blaming Visual Studio 2010 (with .net 4.0) for the installation problems.

This being a completely blurry blog entry, I will provide logs and what the exact error is if anybody asks.

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