Can't access trojan on external hard drive

I ran a virus scan on my maxtor external hard drive and it quickly found a trojan horse (Win32:Morphine-AX [Trj]). When I attempted to put the file into the virus chest I got the message, ("The process cannot access the file because it's being used by another process").The file is "Recycled\Df1.exe\{sys}\coreavcdecoder.ax". Any ideas as to how I can access this file to get rid of the trojan. It's on a maxtor 250 gig external hard drive.
Thanks!