initdb problem

Sorry bub I have two different pc with the same problem.
What I'm doing wrong?

Thanks in advance

PostgreSQL 8.1 on Windows XP SP2 ITA
update from 8.0.4:
- backup previous data
- uninstall and erased PostgreSQL 8.0.4 directory
- rebooted system
- trying install 8.1, but on initdb ...

The files belonging to this database system will be owned by user
"postgres".
This user must also own the server process.

The database cluster will be initialized with locale C.

fixing permissions on existing directory
C:/Programmi/PostgreSQL/8.1/data ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/global ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_xlog ... ok
creating directory
C:/Programmi/PostgreSQL/8.1/data/pg_xlog/archive_status ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_clog ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_subtrans ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_twophase ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_multixact/members
... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_multixact/offsets
... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/base ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/base/1 ... ok
creating directory C:/Programmi/PostgreSQL/8.1/data/pg_tblspc ... ok
selecting default max_connections ... 10
selecting default shared_buffers ... 50
creating configuration files ... ok
creating template1 database in C:/Programmi/PostgreSQL/8.1/data/base/1
... child process was terminated by signal 1
initdb: removing contents of data directory
"C:/Programmi/PostgreSQL/8.1/data"