alright, because i have been known to use it on occasion...
here is my process for figured out which files to download
1)check all the results that come up for an average file size, there will be slight variations depending on the program that was used to rip the cd, and the quality of the file, so take bit rate into consideration, but dont download anything that looks like it is a large variation in size (for insatnce dont download something that is 4 MB when the avg file size is 2-3 MB)
2) make sure it has bit rate listed, other wise (at least for me) the computer wont download it
3) check the number of source, the higher it is the more likely that its the right song and that its good quality, plus it will download faster
4) check the file extension (.mp3 or .wma are music, .exe is an executable program file (dont download .exe's)
all of those should be done, in no particular order, just make sure you do them before you download anything and you should be alright
oh and get a good, free firewall / virus program, avast is the best and fastest running i have found so far