Burning cd

I can only burn one file at a time to cd. After I copy one file to cd

it will eject, I close the tray and then the send to menu does not

show an option to send a file to cd drive E. Sometimes I can remove

the cd, close the tray then put the cd back in and send to menu will

show "send to cd drive E" sometimes not. There have been times when I

could copy several file with no problem. What am I doing wrong? Any

way to stop the tray from opening after I burn a cd? I could stop it

from opening with xp but don't find how to do that on vista.

using CD-R

EMachines T5274

vitsa home premium 32 bit