Installed an Antivirus on a PC;
One month later (scheduled), I scanned, found a good number of detections/infections, then cleaned them.
My questions are:
a- Shouldn't the installed Antivirus prevent viruses from getting onto the PC? or an Antivirus function is just to detect them after scanning?
b- If the Antivirus function is to prevent, should I drop that Antivirus?
1a. Doesn't sound like you scanned your PC immediately after installing the AV. If that's the case, how do you know the infections weren't already on the machine prior to the first scheduled scan?
1b. Yes an AV should prevent things from infecting your machine. But no antivirus, antispyware, antiwhatever is going to be 100% effective 100% of the time. If there was such a product we'd all be using it and every other company would be out of business. That's why on-demand scanners are recommended to supplement the primary real-time antimalware installed on a machine. Some of the more popular (in to particular order) are Malwarebytes, ESET Online Scanner, Superantispyware, Hitman Pro, Trend Micro HouseCall, Windows Defender Offline, Norton Power Eraser, etc.
There is only one Antivirus that I know that scans fully removable devices (flash memory, external HD) before giving the possibility to open them; others try to detect, clean but give the possibility to open them which put the PC at risk; therefore, I ask people not to open the removable device, go to My Computer, right click on the removable device and scan it before opening it (which most peole forget to do)
My question is:
a- Will I go for such an antivirus that fully scan the removable device before giving the possibility to open them?
I haven't tried all available antivirus programs so I'm not sure what features that have or don't have. I'm currently using Microsoft Security Essentials and Malwarebytes. The both provide a right-click option to scan external hard drives, flash drives, files, folders, etc before opening them. I'm guessing that other reputable antivirus products will have the same option to right click and scan. You just have to try and find. (Most products offer a free trial so consumers can make educated decisions about the various products.)