And if Arkhi's suggestion does not help, then you'll have to go to a data recovery specialist to decrypt the files. What you should have done was write those files to disk before reloading your Windows.
I built a new POS Server computer for a client several weeks ago, and their original data was encrypted with EFS. The files could be seen but not accessed on the new computer after transplanting the old hard disk, which had to be put back into the original box so that I could decrypt them first. Only after decrypting the files on the machine that originally performed the encryption was I able to access them on the new machine.