I right click on a folder and select properties, then I select the security tab, then I click the Add button and get the following error message:

I right click on a folder and select properties, then I select the security tab, then I click the Add button and get the following error message:

          Unable to display the user selection dialog
          (null)

When I startup the users and groups snap-in, every group has only one nameless user in it and if I try to add any users I get the same error message. And this also after installing Service Pack -2 following  are some links I found which explain a little any help I would really appriciate.

                                                    Thanks

nkarimAsked:
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nkarimConnect With a Mentor Author Commented:
PROBLEM:
When try to share the folder and give permission rights and try to add any user it prompts with an  Error::
"Unable to display the user selection dialog.  (null)"

Resolution: Referring KB 816818 ,corrected registry

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\SecurePipeServers\winreg\AllowedPaths  

Value: Machine

Type: REG_MULTI_SZ - Multi string

Default Data:

System\CurrentControlSet\Control\ProductOptions

System\CurrentControlSet\Control\Print\Printers

System\CurrentControlSet\Control\Server Applications --> was missing so added it  

System\CurrentControlSet\Services\Eventlog

Software\Microsoft\Windows NT\CurrentVersion  --> was missing so added it  

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turnbjrCommented:
What services do you have running?

-turnbjr
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Alex342Commented:
please check your riched32.dll file in system32 directory. it must be 3.5KB and you can copy from original xp cd-rom. try and enjoy!
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nkarimAuthor Commented:
Alex342,
              Did replace file riched32.dll but it did not work.
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nkarimAuthor Commented:
turnbjr,
           i did not get your question? could you elaborate???

Thanks.
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Alex342Commented:
try this one dll to replace to system32 folder:
http://www.dllsky.cn/soft/18/2007/53214543057.html
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Alex342Commented:
and don't forget to restart computer after replacing the file
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