Always CD burns with Read Only

I’ve just created a ms access database and burnt it to CD. The problem is that when I opened it from the CD it informs me that it is a Read Only file and I can’t do anything to it. Before I burnt it to CD I went into my hard drive and selected the properties of the database file and unticked the options so that there were no ticks in any of the boxes including the “Read Only” box.
Can any one help by letting me know where I am going wrong? I am using Nero 6 to burn the CD. I’ve also noticed that when I copy files down off a CD they immediately are ticked as Read Only.
Thanks where2man