There were some issues after Windows 2003 SP1 release and somehow all are fixed. SP1 will be fully supported in coming hotfix 2.0 which is expected in the mid of next month but for the time being you can fix it manually before hotfix 2.0 release.
First you have to update your machine with latest hotfix 1.9 from here [
http://hostingcontroller.com/english/downloads/HotFixv61_1_9.exe ] . Then open dcomcnfg and give Remote Activation control permission to the user ANONYMOUS LOGON in Launch and Activation Permissions section. You might like to consult with this article.
http://support.microsoft.com/?kbid=892500. Our next coming hotfix 2.0 will do this job automatically.