set blank password for sqlserver 2005 for XP?

[venuvasavi]

Hi,
How can i set blank password for sqlserver 2005 for XP.
I used
[sqlcmd -Q "sp_passwor d @old="123" @new=null @loginame='sa'"]
it will works for win7 but not in XP. please give your valuable suggestion


Thanks in Advance,
VENU