KB963676 fixes Visual Studio 2008 SP1 crash on Vista x64
I blogged earlier about VS 2008 SP1 crashing silently when pulling up a web form or master page designer.
KB963676 is what I have been waiting for. It was made public just last Thursday on 2/26/2009, and the hotfix fixes the crash for me.
The KB description is as follows:
"Uploading both MSI and CBS
CBS Package Request for DevDiv Servicing# 592189
Exchange: Fatal Execution Error in W3WP with .NET 3.5 SP1 - crash in the loader - DomainFile::FinishLoad"
If you are behind on your hotfixes, I would also recommend the following three: KB958481, KB958483, and KB958484.
Eric Hexter has also blogged about this problem.

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Visual Studio Silent Crash with Designer Posted on 3.03.2009 at 11:31 AM
If you’re encountered an issue where Visual Studio 2008 SP1 crashes silently whenever you try to open a web form or master page (which by default will open the design view), there is a hotfix that will likely solve the problem.  I ran into this recently