Problem getting PostgreSQL 8 Beta5 start on localhost port 5432

The installation run smotly on a Windows xp but when I try to start the service
I stops directly. I have installed it on a windows xp, localhost, port 5432 and
I dosen´t get any error in the log, any suggestion?

lista ( a. t.) ernstso n ( d o t ) n   u

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match