[Q] How do I access the SD card on my phone from my PC? topic

hi
i installed a new rom and didnt like it so i want to go back to my old one. i did a nandroid backup before but now i cant access the sd card from my pc.
i want to but the backup on it to then flash it from the recovery. all that is left on my phone is the recovery and it seems like i can not put any files on the sd card from my pc without a rom :(