computer errors dont know where to post this

first when i copy my mums account to my maxtor 160gb external hdd, it copies the files then it fails, after when i try delete it off my external hdd comes up this error i took a screenshot 4 u

http://img89.imageshack.us/my.php?image=99829729td6.png, can u pls help me and tell me how 2 delete it and make it work when i copy files 2 my external hdd, i am sick of everything going wrong 4 me

 

pls reply back and help me