please use the following instructions to recover your envirnment and migrate to Exchange 2007
1- install a new fresh windows on any machine and use the old Exchange 2000 computer name
2- re-install Exchange 2000 using the setup.exe /disasterrecovery switch
3- update Exchange 2000 with same service packs and patches as the old Exchange 2000 server
4- perform a restore for the database from your backup
5- install exchange 2007***
if you need hints on how to install exchange 2007 please inform me
Best Regards
Hesham Mousa