If you've still got the Nokia phone, connect it to you PC, or if not Google Nokia ringtones (there are plenty available on the web). You should be able to find which one you wish to use, then save it to your 'Music' folder. Connect your HTC to your PC and copy the file to the 'Music' folder. Then select as the ringtone to use (I can't get my HTC at the moment to confirm the name of the folder, but I have saved the particular ringtone that I use by this method).