How to modify a file in d drive using power user

[ratna]

am created a excel file in win-xp proffesional. i have given power user permissions. when i am trying to modify a excel file it doesn,t modify the file.and it shows an error.why

 

[ratna]

am created a excel file in win-xp proffesional. i have given power user permissions. when i am trying to modify a excel file it doesn,t modify the file.and it shows an error.why