The two forums that I would suggest are

for Visual Studio 2008 Install and Setup

http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=1017&SiteID=1

for Visual Studio 2008 Express Editions - Installation and Setup

http://forums.microsoft.com/MSDN/ShowForum.aspx?ForumID=1346&SiteID=1

and for VSD Specific functionality or feature issues please continue to use the forums listed under  http://forums.microsoft.com/MSDN/default.aspx?ForumGroupID=11&SiteID=1