Sorry to disappoint you, but there is no way.
Windows Encryption works by assigning your SID to all your files. Only that SID or a SID of the administrator of the pc/domain can decrypt the file. SIDs were designed to be a unique IDing system. Even though you may have the same username/password on the system after the reinstall, your SID is different from the SID used to encrypt the documents. Thus, there is no way you can decrypt them.
It's almost like, you password protected something but have now lost the password and there is no way to recover it ever.
BTW: SID = Security ID - (In the case of your username's SID) A 42 bit security code consisting of your system ID, your system install ID, and your username.
The part that makes SIDs unique: system ID and system install ID.
The part that makes you loose encrypted files in a reinstall (non-repair): system install ID