cdonts problem with window 2003 server

[thaidreamhost]

i user windows 2003 server web edition and plesk 7.5.4
i have problem with my customer to user cdon'ts

it's show error

Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.

Please contact the server administrator to inform of the time the error occurred and of anything you might have done that may have caused the error.

More information about this error may be available in the server error log.

i try to search problem and i do step of this
01. Get the CDONTS dll - you can get it here : http://homepage.ntlworld.com/marklt...iles/cdonts.zip

02. copy cdonts.dll to the folder windows/system32

03. To register CDONTS, run dialog box, type cmd, and then click OK.
At the command prompt, change to the windows/system32 directory, and then type:

regsvr32 cdonts.dll

If the process is successful, the following message displays:
DllRegisterServer in cdonts.dll succeeded.

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but it's still the same probelm

can you have any more help