When you are looking for a particular type of file e.g. mpg or mp3, have a look at the size of the file. If it's a song then it should be over 3mb or if it's a music vid it should be over 30mb. The deadset clue that it's not is if it's around 814kb because thats around the standard size of a malware download. Use the bitzi web lookup everytime to see if someone has been burnt before. Just right click on the download then select advanced then bitzi and you will see if it is a common virus or whatever. I hope this helps dude!