How to delete un-deletable files from pc/computer in Windows xp

First copy CMD.exe file from windows --> system 32 folder to the folder which contains the files to be deleted.

Method : 1

Open cmd.exe  a Command Prompt window will open and leave it open.
Close all open programs.
Click Start, Run and enter TASKMANAGER.EXE or do righclick on taskbar and select task manager.
Go to the Processes tab and do right on Explorer.exe and select End process.
Leave Task Manager open.
Go back to the Command Prompt window and type DEL the file name for example DEL file.txt
Go back to Task Manager, click File, New Task and enter EXPLORER.EXE to restart the GUI shell.
Close Task Manager.

Method : 2

Open Notepad.exe
Click File>Save As..>
locate the folder where ur undeletable file is
Choose ‘All files’ from the file type box
click once on the file u wanna delete so its name appears in the ‘filename’ box put a ” at the start and end of the filename
(the filename should have the extension of the un-deletable file so it will overwrite it)
click save,
It should ask u to overwrite the existing file, choose yes and u can delete it as normal.