Encrypting File System

I encrypted my data on W2K Professional using NT domain account. One day the NT domain was migrated to Active Directory. After that, I found my NT domain profile turned to the initial and I couldn’t open my encrypted data any more. Even though I use local administrator account, it is useless. In theory, the administrator account on the first domain controller in a domain will be the recovery agent for the computer or domain. But originally it was NT environment.

How can I decrypted my data?