hey there!
when you copy psx games the most importaint thing people forget is that the psx unit only likes reading certain cdr disks. you cant just use any. use:

1. tdk - 74 min/650mb
2.verbatim datalife plus

if you still have problems after trying that
make sure you havent used a dodgie crack for cdrwin.
and make sure that you leave all the settings in cdrwin on default.

hope that can help you.

hannibal lecter