When I installed SQL Server 2005 on my Windows XP machine everything seemed to work fine. However, whenever I tried to create a new database via the Workbench I’d get an error complaining about COM+ initialization. I tried "everything" but couldn’t persuade it to work. Eventually I gave up! However, I recently installed IE7 and discovered that I couldn’t type a new URL into the address bar and have IE goto that page. After trawling the web I found someone with the same problem and the solution was to uninstall the NVidia (motherboard) firewall client. It suddenly struck me that perhaps that was the cause of my SQL Server problems and…yes it was! SQL Workbench is now working correctly. Bad old NVidia 😉