Apple macbook question! urgent?

[Olivia]

well, i have a apple macbook and i was looking through my finder. i was searching for a song that started with a "T", so i typed T in the search button in the top right corner of the finder window. I was searching through the whole computer so everything that had a T came up. When the search results came up, there were these pictures of my friends on myspace that i had not downloaded and somehow they had downloaded onto my computer. There were also these blank pages that i couldn't open and the file name had lots of numbers and letters. I have no clue what they are. i deleted them to make sure they didnt come up again, but they may be more files starting with a, or b or c but because i only typed T the other files may not have came up. im not sure if this is the problem why my mac is downloading myspace pictures to my finder and other wierd files, but i have downloaded some songs off media converter and that may be why but im not sure. also when i opened a "unknown folder" it said something about alias and that it couldnt be found?? please help!! i dont know whats wrong!