1.) To clear the waiting files, select the folders/files from the "Files to add to the CD/DVD" area and press Delete. However, if you want to clear all the files, right-click the CD/DVD drive and select "Clear staging area" from the context menu.
You can also manually delete the files, which are stored in the following location:
%USERPROFILE%\Local Settings\Application Data\Microsoft\CD Burning folder
2.) on your windows explorer window to your left under CD Writing Taks. Delete
temporary Files, Click that and your problem should be solved.
3.) a. Boot SAFE MODE and try again. See Google if you forgot.
b. Find FILE ASSASSIN and use that. See Google if you can't find it.