find out the maker and model number by right click on my computer, select properties, click on hardware tab then choose device manager. This gives you a list of your hardware, click on dvd/cd rom drives and you will see the info, go to google and type in the name, model and the word 'specification' without the inverted commas. this should get you a spec for the drive which will tell you what it is capable of
IIRC some drives may require a firmware update to cope with higher speed disks (will be available on the manufacturer's website; however if you are unsure about doing this, don't. It could mean a drive fit only for the dustbin).
If you sitll have the box or manual for your drive it will list the specifications and the type of disks it will handle.
Either as terryf has said your DVD burner will not burn to + disks only to - disks or, the burner doesn't like the particular make of disk you are using. If its the latter then dropping the speed of burning may help as might changing the brand of disks.
Once you identify your DVD burner go to the website of the manufacturer of the drive. there it will tell you what kinds of disks your drive will burn and it will probably give you the names of the recommended disks. These are just the ones they have tried and have worked ok, just because you are using a disk that isn't on the list doesn't mean it won't burn ok. Its a bit of trial and error with some disks I'm afraid. I was lucky I suppose, the first ones I bought for mine worked perfectly and because of that I just stick with them.