Me as well can not install the client components on boxes that have CLR 2.0/Office 2007 already installed. Notice that the failures have occured on boxes that doesn't have any SQL Server 2005 components installed. I do not know if it is CLR 2.0 or Office that causes the failures.

The error I'm getting initially is the same as Bogey1 and willgart: "

Upgrade failed due to the following error. The error code is:

-2147467259. Message: Unspecified error"

I have narrowed the failure down somewhat further; it occurs during installation of Business Intelligence Development Studio and it seems to happen during a process when it tries to upgrade the Microsoft Report Server (I have not installed Reporting Services - and it does not make any difference if Reporting Services is installed or not).

The workaround is obviously to choose an advanced setup and de-select BI Dev Studio from the Client Components installation node.

So far this has happened on following boxes:
1. LongHorn Server Beta 3 (LH) with CLR 3.0 and Office 2007 installed
2. A complete new install of LH Server, i.e nothing on the box that is not part of a normal LH installation (notice that CLR 2.0 is part of a LH installation).
3. Win 2K3 sp2 with CLR 3.0 and Office 2007 installed

In the installations above I have no Visual Studio bits installed what-so-ever

The installation succeeded on a complete new Win 2K3 sp2 installation; i.e. no CLR 2.0 bits and no Office 2007 bits.

Hope someone can shed some light on this.

Niels