Not sure what the picture has to do with your issue ?
Anyway down to your real issue.
If you downloaded the IDE from this site it should not be an issue with your antivirus / antimalware.
You should tell us which software is giving you that error but I suspect its a driver problem.
Are you using a REAL arduino or a clone ?
If it is a clone you may need a driver CH340/341 or CP2102
There are some sites out there that offer drivers but may offer nefarious things instead always make sure you get the OFFICIAL drivers for hardware.