Restore work saved on DVD with Nero Premium 7

Hi and thanks for the welcome.

I have just had my computer reformatted and I saved my files etc. to 6 DVDs but cannot now restore them. I have spent hours last night and most of today, everytime I think I have done it I cannot read it. I got them back on the C: drive but cannot then access them through the program. Hope someone can help please. Mavis