when i try to open the hd from my computer it open in a new window why that happen and when i right click it there something call auto in bold. i found auto.exe and autorun inside the hd when it show hidden files, can there be something wrong with it?

That is a malware infection.

Read this post and follow the instructions:

http://www.d-a-l.com/help/showthread.php?t=32403

Post a HijackThis log in that section. Not here please.