Unable to Deploy process via Designer

Hi, I have just installed BPM 9 SR1. everything was ok until when i was trying to deploy a process. When i click Deploy. It prompted me to enter username and password. After entering it,it keep prompting me a warning message stating my username and password are invalid. May i know where is this username and password is being authenticated? I've checked from the Event Viewer, and this is the message i got. " Authentication failed for DCOM connection [ ], username [sa], additional data: Invalid user name or password." Anyone know what exactly i missed out???

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