Failed to install Visual Studio 2008 SP1

If your system has Microsoft Office installed, you may encounter problem when installing Visual Studio 2008 SP1.

The log shows the "Visual Web Developer" is causing the error.

Here is a solution that works for me. You can give it a try.

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Rename (or Delete) these two registry keys:

HKEY_CLASSES_ROOT\Installer\Products\00002109120000000000000000F01FEC

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\00002109120000000000000000F01FEC

Renaming the directory

C:\Program Files (x86)\Microsoft Web Designer Tools\VWD

To

C:\Program Files (x86)\Microsoft Web Designer Tools\Junk



(source : http://social.msdn.microsoft.com/Forums/en-US/vssetup/thread/315c7885-e680-4a83-b6a5-8a2795f596ea )