@ J-Kashmiri

Avast has warn you about autorun.inf worm infections transmitted via flash drive.

I recommend as a preliminary solution run Quick or Full scan with your antivirus. Before you do that, you need to check USB memory devices and if they are infected and they are, they need to be clean up too. To do that, you may use MCShield. For additional system check you can use Malwarebytes. The following tools are free&compatible to work with your antivirus program and after use is recommended that you leave them on your computer.

  1. Check USB storage devices / removable drives via MCShield

Download MCShield from one of the following links:

MyCity - Official download link
Softpedija - Mirror download link

[*] Double click MCShield-Setup to install the application.
[*] Wait a few seconds to MCShield finish initial scan.
Recommendation to under General and Scanner tab you click on Defaults button to choose recommended options.
[*] Connect your USB storage devices to the computer one at a time. Scanning will be done automatically.

Explanation: USB storage devices are all the USB devices that get their own partition letter at connecting to the PC,
e.g. flash drives (thumb/pen drives, USB sticks), external HDDs, MP3/MP4 players, digital cameras,
memory cards (SD cards, Sony Memory Stick, MultiMedia Cards etc.), some mobile phones, some GPS navigation devices etc.

… … … … …

  1. Additional system check via Malwarebytes;

http://i424.photobucket.com/albums/pp322/digistar/mbamicontw5.gif
Please download Malwarebytes Anti-Malware from here.
Double Click mbam-setup.exe to install the application.

[*]Make sure a checkmark is placed next to Update Malwarebytes’ Anti-Malware and Launch Malwarebytes Anti-Malware, then click Finish.
[*]If an update is found, it will download and install the latest version.
[*]Once the program has loaded, select “Perform Quick Scan”, then click Scan.
[*]When the scan is complete, click OK, then Show Results to view the results.
[*]Make sure that everything is checked, and click Remove Selected.
[]When disinfection is completed, a log will open in Notepad and you may be prompted to Restart. (See Extra Note).
[
]The log is automatically saved by MBAM and can be viewed by clicking the Logs tab in MBAM.

Extra Note:

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.