Hello nitsana and welcome to the forum.
You most likely got this infection through an infected USB/removable device. Please follow the three (3) steps below:
1. Please 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, which means to disable autoruns from infecting your machine again (or in this case
preventing further damage from the current infection), 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.
2. Check your computer for malware with Malwarebytes’ Anti-Malware (
MBAM).
· Download
free http://www.malwarebytes.org/ for an on-demand scanner.
· Double Click mbam-setup.exe to install the application.
· After install, click
update so you have latest database before scanning.
· Under Settings:
o
General: Automatically Save File After Scan Completes is checked off
o
Scanner Settings:
Check all boxeso
Updater: Download and install update if available is checked off
· Once the program has loaded, select "Perform
FULL Scan", then click Scan.
· The scan may take some time to finish, so please be patient.
· When the disinfection scan is complete, a log will appear in Notepad and you may be prompted to Restart. (See Extra Note).
· Click the
“remove selected” button to quarantine anything found. You will find the infection details under the Quarantine tab.
· The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.
·
Copy & Paste the entire report in your next reply.
If MBAM encounters a file that is difficult to remove, you will be presented with 1 of 2 prompts -- Click OK to either and let MBAM proceed with the disinfection process; If asked to restart the computer, please do so immediately.
3. Check the information on the
first post of this thread under Virus/Worms for you to check your machine for malware:
http://forum.avast.com/index.php?topic=53253.0.
Follow the directions for obtaining the
OTL logs. Post the two (2) OTL log as an
attachment (Additional Options > Attach > Browse (the logs will be on your desktop > Post). You can do this after posting your MBAM log.
Please let me know if you have any questions. Thank you.