I’ve finally cracked the installation problems with VS 2003 SP1 on Vista. The problem seems to be that the SP must be installed under the same credentials that Visual Studio was installed. I.e. I installed Visual Studio under the domain administrator credentials, but I run my day-to-day under a standard user credential. When installing the SP1 I was elevating my standard user credential rather than running as the domain admin. I don’t know what difference that makes to anything, but it’s worked!
Where was that purchase requisition for 2005?