Take the 2-minute tour ×  I'm trying to install SQL Server 2008
on an XP machine alongside SQL Server 2005, however during the
instalaltion process the user that the SQL server browser is to
be installed under is listed as "Domain\Machinename" - I'm
unable to change that "user" and the installation fails with the
message "invalid user "Domain\Machinename"".  The installation
does technically finish, and the client components are
installed, but I cant see the new SQL server instance services
in administrative tools and I cannot connect to my new instance.
I've already tried uninstalling and re-installing SQL Server
2008 with no joy - does anyone have any ideas on how to fix with
(preferably without removing SQL server 2005)  share|improve
this question add comment  3 Answers  It kinda sounds like
you're trying to install SQL 2008 as the default instance when
the default instance already belongs to your SQL 2005 install
(there can be only one default instance). If this is true then
you'll have to do one of the