Change other password in xp
U can change others password in windowsXP Who told WINDOWSXP has security

Click on START-->RUN.
Type: compmgmt.msc & press enter.
In the left pane, select COMPUTER MANAGEMENT--> SYSTEM TOOLS--> LOCAL USERS AND GROUPS--> USERS.
Then in the right pane, select the user name whose account you want to hack. RIGHT CLICK and then click on SET PASSWORD from the pop-up menu.
Enter the new password. Click on OK

one more way
In command prompt, type

net_user_accountname_*

_ denotes space
accountname denotes account name


this will ask u to give a new password for the account