During my time using Avast, I've ran intermittent full scans on my computer, but since there seems to be three different ways of doing this, I'm not sure which one would be the best and most effective one. I've mainly used the method of simply going to My Computer folder, right clicking C: and selecting "Scan with Avast". However, with 372 gb of my C: disc space (with 27 gb remaining), this tends to take well over couple of hours to complete, pretty much three and half hours after updating my PC to Windows 10. "Full scan" option in Avast program itself usually takes only little less time than that. However, I've found that scan done with Avast's custom scan where I can choose scannable drives and folders tend to be much faster, even taking only half of time C: right click scan, while scan results have the equal number of scanned files, folders and gigabytes. However, since each scan method takes different time, does that mean that scan mathod that takes more time is more thorough or are all three different methods as good by default?