Many people reported that after installation of IE7 Beta 2 Style Builder in Visual Studio 2005 and Visual Web Developer Express stops working (it shows up and immediately disappears). Here is how to fix the issue:

1. Add the following key to the registry

HKLM\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl\FEATURE_CSS_DATA_RESPECTS_XSS_ZONE_SETTING_KB912120

2. Under the key create a DWORD value of 0 named devenv.exe.

For VWD Express the key name should be vwdexpress.exe.