SQL Server 2008 R2 failed to install

I recently got this error when trying to install SQL 2008 R2 Developer edition (64 bit) on my Windows 7  Enterprise (64 bit) workstation:

SQL Server setup has encountered the following error:

msigetproductinfo failed to retrieve productversion for package with product code = ‘{633F3A7E-471D-4C08-A643-C184A2EE19AB}’. Error code: 1608..

Found the solution to this on the web

I switched the characters in the first part of the GUID string. 633F3A7E became E7A3F336 and searching for this string in my registry using regedit.exe, located this key that I then deleted (make sure you backup anything you change in your registry prior this!)

[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\UpgradeCodes\8F1DEBB53F6E20A4CB79623DB52E00AC]
"E7A3F336D17480C46A341C482AEE91BA"=""

After doing this, the installation went ok!

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