i use real player 11 for my media files and in the process of burning a cd,itasked me to upgrade if i wanted to burn wma files which i did.after downloading,i restarted the system and i removed the cd rw in the drive before it boot,but since then,i've not been able to burn cds,erase data on my rewritable cd.it keeps bringing error messages and i dont know whta to do.i use a generic cd rom driver matshita ujda70.please i need your help.