Adprep error

[ben51]

Hello,

I try to upgrade my Windows 2000 server SP4 to Windows 2003 Server R2. When
I run adprep /forestprep, I have this error :

=============================================================================
"attributeId" attribute value for objects defined in Windows 2000 schema and
ext
ended schema do not match.


A previous schema extension has defined the attribute value as
"1.2.840.113556.1
..4.7000.187.102" for object
"CN=uid,CN=Schema,CN=Configuration,DC=ilmh,DC=be" di
fferently than the schema extension needed for Windows 2003 server .
[Status/Consequence]
Adprep cannot extend your existing schema
[User Action]
Contact the vendor of the application that previously extended the schema to
res
olve the inconsistency. Then run adprep again.




=============================================================================
"isSingleValued" attribute value for objects defined in Windows 2000 schema
and
extended schema do not match.


A previous schema extension has defined the attribute value as "TRUE" for
object
"CN=uid,CN=Schema,CN=Configuration,DC=ilmh,DC=be" differently than the
schema e
xtension needed for Windows 2003 server .
[Status/Consequence]
Adprep cannot extend your existing schema
[User Action]
Contact the vendor of the application that previously extended the schema to
res
olve the inconsistency. Then run adprep again.




=============================================================================
"attributeSyntax" attribute value for objects defined in Windows 2000 schema
and
extended schema do not match.


A previous schema extension has defined the attribute value as "2.5.5.5" for
obj
ect "CN=uid,CN=Schema,CN=Configuration,DC=ilmh,DC=be" differently than the
schem
a extension needed for Windows 2003 server .
[Status/Consequence]
Adprep cannot extend your existing schema
[User Action]
Contact the vendor of the application that previously extended the schema to
res
olve the inconsistency. Then run adprep again.

Could you help me