A windows user not knowin how to format ? Its like living w/o breatin
...
Enter DOS by typin "Cmd" in Start > Run.
Type --->
Format x: where "X" is ur partition alphabet which u wanna format.
Another workaround :
Right Click My Comp > Manage > Storage > Right click the partition u need to format/delete and choose te respective option.
To erase the whole windows, boot from a DOS disk, and type that "Format" command.
For more params, type format /? in dos/cmd