Just a 'mee-too'.
I try to install veeam-Monitor 3.0.2 (free) on my Vista64 WS running SQL 2005 (64bit).
The User-Accout i gave is my domain-user ( local admin with SQL-Server admin rights couldn't login, DBUtil in a runas-Shell with that account worked though
I tried 'KST-LAP\MSSQL.1' which is %COMPUTERNAME% and Instance-Id and 'KST-LAP\MSSQLSERVER' which is default instance-name.
DBUtilTest.log says: 01/15/09 09:41:39 00001900 0x0000076C "Unable to connect to db, code - -2147467259"
Firewall is down, TCP/IP enabled and used by several other apps.
I'll send this also to support.