This is a problem occured in video files(I had almost a same problem).Download Virtual Cdv5 and make a virtual cd of the cd/dvd that contains the video files of POP. Reinstall and just when it asks for the cd (which has the video files inside),insert the virtual cd so that it copies the files from there.I think the problem should be solved.If you have any difficulty in applying my method you can mail me in swapnil560@yahoo.com.