When you open the Active Directory Sites and Services snap-in, you receive:

The instruction at 0x71d80a80 referenced memory at 0x00000000 The memory could not be read. Click on Ok to Terminate the program.

NOTE: The exception address may be different.

NOTE: Instead of the error message, the program may quit unexpectedly.

This is generally the result of a missing or corrupt set of registry entries.

NOTE: I would export any keys you intend to import so you will have a backup. You may want to check the backup against the import files and merge any differences.

If the HKEY_CLASSES_ROOT\LDAP key is missing or damaged, import:

<b>Windows Registry Editor Version 5.00

\[HKEY_CLASSES_ROOT\LDAP\]
@="URL:LDAP Protocol"
"EditFlags"=hex:02,00,00,00
"URL Protocol"=""

\[HKEY_CLASSES_ROOT\LDAP\Clsid\]
@="\{228D9A81-C302-11cf-9AA4-00AA004A5691\}"

\[HKEY_CLASSES_ROOT\LDAP\shell\]

\[HKEY_CLASSES_ROOT\LDAP\shell\open\]

\[HKEY_CLASSES_ROOT\LDAP\shell\open\command\]
@="\"D:\\Program Files\\Outlook Express\\wab.exe\" /ldap:%1"</b>
If the HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\} key is missing or damaged, import:

On a Windows 2000 domain controller

<b>Windows Registry Editor Version 5.00

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\] @="ADs LDAP Pathname Descriptor Object"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\InprocServer32\]@="activeds.dll"
"ThreadingModel"="Both"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\ProgID\] @="Pathname"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\TypeLib\] @="\{97d25db0-0363-11cf-abc4-02608c9e7553\}"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\Version\] @="0.0"</b>

On a Windows 2000 member

<b>Windows Registry Editor Version 5.00

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\] @="ADs Pathname Object"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\InprocServer32\]@="activeds.dll"
"ThreadingModel"="Both"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\ProgID\] @="Pathname"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\TypeLib\] @="\{97d25db0-0363-11cf-abc4-02608c9e7553\}"

\[HKEY_CLASSES_ROOT\CLSID\\{080d0d78-f421-11d0-a36e-00c04fb950dc\}\Version\] @="0.0"</b>