When you put a blank disc in the drive, you should get up a pop asking you whate you want to do. Select "open writable CD folder".
Select the files you want to write to CD in Windows Explorer and click on file >send to >CD. This will then copy the files to the CD writing folder. Return to the CD writing folder where you will see your files waiting to be written to CD and then click on "write to CD" and hey presto! all done.
I hope this is of some help. I would add that I am doing this from memory so I hope I've got it right!
Otherwise post back and somebody will be able to help.