What am I doing wrong?

[skipjackk]

Please help. I have been making back ups for a while now, but consider myself to be still a novice. I just tried to make some on a new computer and I can't seem to get it. I'm using CDRWIN 4.0a beta and a Plexwriter. I'm using the same settings I used before, but the discs just aren't working. I've tried different methods and just wound up with a bunch of coasters. I've gone from disc to disc, made an image file, I even tried Clone CD, nothing. I heard Plextor was one of the favorable writers. Anyone have an idea??
Thanks for any help.