Show Import/Conversion Problem

Show Import/Conversion Problem

On 9/15 I imported a PPT file.twice. Had the same problem that has been reported previously - imported ok, but would not convert and the progress bars are still going as of 9/21. I successfully converted the PPT file with Google Documents so all I want to do now is find a way to delete these two failed attempts from my
'Show' folder, Any help will be appreciated.

Thanks