Avast quarentines same file every few seconds! Make it stop

Hi I just downloaded Avast so I’m not aware of all it’s features and how it works yet but for 2 days now it keeps detecting and removing the same file to the virus chest - every 26 seconds in fact. Ive stopped the pop-ups but is there any way of setting Avast to automatically delete the file each time it is found? Or at least delete the entire contents in the virus chest in one go - its getting pretty crowded in there and I’m concerned for my computer.

The file is C:\sdfqh.exe, infection: Win32:Rootkit-gen[Rtk]

Does this mean anything to you? Is it actually a virus or is it part of my computers normal function?
Any help much appreciated

Check your computer for Malware with

Malwarebytes Antimalware http://filehippo.com/download_malwarebytes_anti_malware/
after install click UPDATE and run quick scan, click on REMOVE SELECTED to quarantine anything found

SUPERAntiSpyware http://filehippo.com/download_superantispyware/
Are cookies really spyware and are they dangerous?
http://www.superantispyware.com/supportfaqdisplay.html?faq=26

If anything is found come back and post the scan logs here