Seeing '0 free space' is normal since windows cannot write directly to the disk, hence there is no free space as far as it is concerned. However the writre error is a bit more unusual. I would try 3 things - make sure alcohol is updated to the latest version, try a different brand of CD (particularly if you have been using cheap unbranded ones up till now) and if that doesn't help try & speak to the place you bought it from about getting the drive itself checked out
