Turn Off System Beeps

Go to HKEY_CURRENT_USER\Control Panel\Sound, and find the Beep and ExtendedSounds String values. Set each value to No. Exit the Registry and reboot. The beeps will no longer sound. Hey, your XP is no longer noisy!!

How do I eliminate the duplicate rows ?

SQL> delete from table_name where rowid not in (select max(rowid) from table group by
duplicate_values_field_name);
or
SQL> delete duplicate_values_field_name dv from table_name ta where rowid <(select min(rowid) from
table_name tb where ta.dv=tb.dv);
Example.
Table Emp
Empno Ename
101      Scott
102       Jiyo
103      Millor
104      Jiyo
105      Smith
delete ename from emp a where rowid < ( select min(rowid) from emp b where a.ename = b.ename);
The output like,
Empno Ename
101      Scott
102      Millor
103      Jiyo
104     Smith