More or less similar to what Vishal said.
This is from another forum:-If your hard drive right-click menu has an "autoplay" option, it maybe some Trojan horse on your hard drive.
First, reboot your system and get into the safe mode.
Second, change setting to show all files on your hard drive
Then, if there is a file which name is "autorun.inf"under your hard drive's root directory, delete it.
You must delete the Trojan horse under the hard drive's root directory and delete the start-up option of it
After that, reboot your computer.
All done!
Now look at your hard drive right-click menu, the "autoplay" option is disappeared. "