Would it be possible for you to take the disk to your friend computer and see what the properties are for the disk.
Specifically what is the File System ?
UDF,
ISO9960,
Juilet,
CDFS,
or other?
Were you using the disk like a floppy where you just clicked and drag file or did you actually burn it?
If you are see if Nero's INCD is still installed properly?
You said you used Nero is it the same software or a new install of an upgrade or anything like that?
INCD uses a UDF format that is a pain, because there are main flavor of UDF and they are all not compatible.
Never Say Never (Romeio Void)
Homebuilt MSI MD5000MD-5000 M-ATX, 2.4Gig, 393mb, WinXp Pro
Homebuilt Iwill KK266R-Plus, 768mb, WinXp Pro