dvd-r to dvd+r?

Hi

I am using nero essentials 7.10 , and i have some DVD-R'S , can you copy and burn them to DVD+R?

I thought i had before , maybe not, but tonight i got an error message, not compatible change settings, if so how do you do that?

The first window did say to put a DVD-R in after i tried again.

Lite on burner, 1 20 ah something like that, it burns them dvd-r to dvd-r ok.

These dvd-r's came from a stand alone, dvd recorder from my tv set , not on the pc.
VISTA HOME PREMIUM 2 GIG RAM, AMD 64 ATHLON X2 4600 2- 160 HDS, 1-250 EXT HD.

thanks

:confused