Installation Exchange 2010 Issues

Hi,

I have installed exchange server and then i have removed it from adsiedit (i had no choice!)

Now it doesn't appear on other exchange's servers console.

But when i have reinstalled the entire OS with the same name as the old server, i tried to install teh mailbox role I get this error:

Erreur :
L'erreur suivante est survenue lors de l'exécution de "$error.Clear();
     if (!(get-service MSExchangeADTopology* | where {$_.name -eq "MSExchangeADTopology"}))
          {
  
Le mappeur de point final n’a plus de point final disponible.          install-ADTopologyService
          }
        " : "Le mappeur de point final n’a plus de point final disponible. (Exception de HRESULT : 0x800706D9)".

Le mappeur de point final n’a plus de point final disponible. (Exception de HRESULT : 0x800706D9)
Cliquez ici pour obtenir de l'aide... http://technet.microsoft.com/fr-FR/library/ms.exch.err.default(EXCHG.141).aspx?v=14.1.218.11&e=ms.exch.err.Ex88D115&l=0&cl=cp

How to solve this problem?

Thanks