Where did my fragmentor disc?.

Why can I not get this message 'DUSER.dll is not found, reinstalling may solve the problem.' I tried to defrag my computer, as I did before. Where he went to and how to re - install it please.

Duser.dll must be in C:\Windows\system32.

A copy of the current version (5.1.2600.5512) should be in C:\Windows\ServicePackFiles\i386.

If you do not have a C:\Windows\ServicePackFiles\i386 folder, you should be able to develop an older version of a real Windows installation CD or a C:\i386 folder (use the Expand command).

If you find a copy of the file, put it in C:\Windows\system32 and C:\Windows\system32\dllcache (a hidden folder).

If you are using an older version, visit Windows Update to see if a newer version will be offered.

On the other hand, I've seen suggestions that this error can do not actually mean the duser.dll file is missing.  If the file was not, in fact, missing, start by making a check full of malware.
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