The 1067 error is a general error meaning that a service has failed to start.   I would check your event log to see if there is further information there, and also in the SQL log.  Also, try starting the SQL Agent service from the command prompt with the -v switch to display the output to the diag screen.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/coprompt/cp_sqlagent_8s32.asp