I am having a hard time figuring this one out so maybe you guys can offer some suggestions? For about the last three weeks or so, I have been having problems burning data CD-Rs. Almost every time I have tried burning a group of files to a CD-R, I get a buffer underrun error. This has rarely if ever been a problem before with this PC. I am running an older Dell Dimension 8100 PC with a 1.8 Ghz P4 and 256MB of RAM with Windows XP Home and Nero 22.214.171.124. The CD-RW drive is a 12X Samsung SD-616 which came with the PC. The buffer underrun errors are occuring with different brands of media and at all burn speeds. Last weekend I defragged the hard drive (which took several hours to do) with a demo version of Diskeeper and that seems to have helped performance in other areas but not with CD burning. Yesterday, I tried running the Windows Disk Cleanup utility but after running it for about 4 hours, it appeared as though it was never going to finish so I stopped it. I believe it identified about 7GB worth of unneccessary files and was in the process of removing them but I needed to use the PC. Anyway, is there anything that you guys can think of that I can try to hopefully fix this annoying problem? I'd really like to free up some space on the hard drive in order to make room for some new software (ArcView 8.3) and it's associated files which can get rather large. I still have nearly 30 GB free but I'd just like to make a bit more room. Thank you.