My PC usually gets infected with viruses whenever I plugin any of my friends Pen Drive. Here is a simple tool known as iKill which prevents the spreading of viruses from Pen Drive to your PC.
It works by scanning the drives for the presence of removable drives. If found, it parses the autorun.inf file for the executables it may run. If AutoProtect is enabled,it will automatically delete the files present on the drive. Otherwise, it will prompt you for your permission to delete the virus. Version 2 includes unspecified updates.
Download Instructions : Click here to download