Hello, I am not real good with computers, and I've tried everything I could and right now am trying wherever I can to solve my problem. Ever since I bought this new 50 CD-R pack, like half of them have failed to burn. The other half worked. First, as usual I tried the traditional "click-and-drag" method to copy files to the cd. I got a couple of errors from that. So then I tried to burn them with nero. It worked fine for a while, then my CD-RW drive disappeared. I tried whatever I could to get it back, but the only answer seemed to be a format. I formatted the entire drive C and the CD-RW drive was successfully back. Then I tried to copy files into CD-R's again with Nero, and now I get errors every time. Have used up like 10 cd's so far. The errors from nero express 6 are... "Power calibration error." "Invalid write state." "Could not perform EndTrack." "Could not perform fixation." "Burn process failed at 24x(3,600 KB/s)" Ps. I've tried at slower speeds too. I've got no idea what is causing this. From other forums I've been told to get another brand of CD's. That could be the case, but I also have bought this same brand twice and the first time like 45 out of the 50 CD-R's worked perfectly. Please help, my computer has nearly no memory lol, Thanks in advance.