-- display the available snapshots
select snap_id, to_char(begin_interval_time,'yyyymmdd hh24:mi:ss')
from DBA_HIST_SNAPSHOT
where begin_interval_time > sysdate-7
order by 1
;

-- produce the AWR report
@C:\oracle\product\10.2.0\RDBMS\ADMIN\awrrpt

or:
@?\rdbms\admin\awrrpt