fucked up desktop

i wanted to change the pic of my desktop, but after i had changed it some sucky blue thingies appeared behind my programshorcuts, anyone who knows how to fix it

and i want to get rid of that classic xpstyle, but i just cant find the solution to change it

need help, a windowsnoob >:(

http://img172.imageshack.us/my.php?image=desktoppp6.jpg

^^^^^^
DESKTOP