hello joe935, welcome to CDRLabs.
what you are doing is called packet writing
packet writing software is a soft of driver that installs itself into the operating system and enables a "drag-n-drop" capability from Windows Explorer into a CDRW disc.
Sony abCD software is such a software
packet writing sotware is notoriously unrelieable. the only advice i can give you is to stop using it and do "regular" CD burning.
moreover, many people feel that CDRW (media) is unreliable too, and would recommend against using it, just use plain CDR.
if you do
use CDRW, i can only recommend Verbatim. Memorex CDRWs are usually bad. you can check with Nero InfoTool or Nero CDSpeed who is the manufacturer of the Memorex CDRW you're using. very likely it's Infosmart - bad!
One Ring to rule them all, One Ring to find them,
One Ring to bring them all and in the darkness bind them
In the land of Mordor, where the Shadows lie
M.C. Escher - Reptilien