In addition to what Pondus posted and we are awaiting your MBAM log, you can also do the following:
1. Format or cleanse your USB / flash drive: Right click from Windows Explorer and do a full format to cleanse your USB flash drive.
2. Download and install Panda USB Vaccine for USB devices
http://research.pandasecurity.com/panda-usb-and-autorun-vaccine/ and it can be run on any drive on your machine for removable devices. You are given the option to "vaccinate" your machine....click "
Yes/OK", which means to disable autoruns from infecting your machine again, and you can enable it again (although I wouldn't). Plus you can "vaccinate" any USB/flash or removable device so that it cannot infect your machine. This type of malware is easily transmittable because many people use USB's. This will prevent any autorun.inf malware from spreading in your machine.
Once we review your MBAM log, we can give you additional instructions. Thank you.