I use this to download songs. Most songs download just fine but others have problems. A message box pops near the end of the download and indicates that the file is corrupted sumhow. Then it asked if i'd like to continue the download anyway, yes or no. Clicking no simple disregards the file and i'm forced to search for another but clicking yes allows the file to complete. However it will not play and it says that the file is 30 mins long when in actualality it is no more than 4. WHAT IS GOING ON?

1. Am i downloading a virus?
2. What makes a file corrupt?
3. How do i fix this?