UPDATE: I found a fix. See here.
Right. Let get this straight. I’m running Vista Business with Visual Studio 2005 Standard installed (and All the extras – SQL Server etc).
The short version is that Visual Studio 2008 Professional refuses to install itself. It installed .Net 3.5, Document Explorer 2008 and the Web Authoring Component and then quit at some point while installing Visual Studio itself.
Heres the error log:
Microsoft Visual Studio 2008 Professional Edition – ENU:  ERROR:Error 1935.An error occurred during the installation of assembly ‘Microsoft.VC90.DebugCRT,version=”9.0.21022.8″,publicKeyToken= “1fc8b3b9a1e18e3b”,processorArchitecture=”x86″,type=”win32″‘. Please refer to Help and Support for more information. HRESULT: 0x80070BC9.
I’ve no idea what is going on. If you Google search the Error Code you get this error for VS2005 (or SP1), .Net 2 or SQL Server. Searching by HRESULT points to this MSDN Forum where the discussion is about a VS2008 Compile problem.
Now here’s the thing. It installs perfectly on my laptop (also running Vista Business with Visual Studio 2005 installed with all the bells and whistles). So the download ( and no, its a perfectly legal copy) is definitely not corrupted.