Got this lovely message yesterday when installing a new vCenter 4.1U1 for a customer. Never seen this one before. Until I found this thread. I was very suprised to see the resolution. Here’s a tip for all of you: Don’t name your vCenter Service account the exact same name as your vCenter Server.
When we renamed the service account to have a different name from the vCenter server itself, all installed fine. I had to post it, this issue really surprised me.