scanning and removing?

hi, this might sound stupid but, i got an internal hard drive from a mate and it had trojan horse, infostealer and W32.sillyFDC on it.  Norton has removed all the risks but im still scared to use the hard drive.  Is it just a senseless issue and the risks have been removed or i have something to worry about.

 

Can anyone help please?

 

Thank you in advance