-2147467259.Message:Unspecified error when installing Business Intelligence Development Studio (SQL2008, 64bit)
Definately, long time no see!
I was setting up my new work machine, and during installation of Business Intelligence Development Studio in SQL2008 64-bit, I got the aforementioned error (I had installed VS2008 to other than the default location). Fortunately, following KB article solved the problem:
http://support.microsoft.com/default.aspx/kb/960127