Surprise ....... i Couldnt because it gave me thie Error :
Heres the image with the Error wroten at top...Microsoft Management Console wrote: MMC Cannot Open the file C:WINDOWSsystem32dfrg.msc .
This May be because the file does not exist,is not an MMC Console, or was created by a later version of MMC.
This may also be because you do not have sufficient Access rights to the file
I Have Google d a bit but didn't got my answer so i remembered i put a password on my Administrator Account
in Windows XP Professional Go To "C:WINDOWSsystem32" Search for dfrg.msc Right Click And Select Run As...
Select the Administrator account and Write your password Click ok and you will be able to Access the Disk Desfragmenter
if you dont remember what was the password you may change it by fallowing the instruction bellow
Open Command Prompt And Run " net user Administrator * " (Whithout quotes ("") ) type a password and thats it..
Hope this was helpful for you Googlers lol