Cannot Run Disk Defragmenter

I have just upgraded from XP Home SP2 to XP Professional SP2 and can no
longer execute Disk Defragmenter using my normal user account.

I get the error message "MMC cannot open the file
C:\Windows\system32\dfrg.msc. This may be because the file does not exist,
is not an MMC console, or was crearted by a later version of MMC. This may
also be because you do not have sufficient access rights to the file".

I have created a new user account, which executes Disk Defragmenter
successfully. Hence I think I have a problem with access rights on my normal
user account.

How can I re-set the access rights on my normal user account?

Any help appreciated.


.

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