If you turn back here by any chance, I'd say that you should have read chef's question.
Your combo doesn't read DVD+R (RW) - it only does read the minus format DVD-R(RW) and DVD-RAM (my notebook has a Tosh that does the same)
And can write only to DVD-R(RW).
So the only chance you have to read discs from that friend of yours it is to ask him to use DVD-R media or to use bitsetting for DVD+R, as a way that allows your drive to consider them as DVD-Roms and read them.
I've a Samsung player that does just like that, and these were me only options to use it to read the discs written by my Plextor.
At least I was not forced to refuse all my Plextor's discs and it was just a drive, not a friend....