: Move the file to your Trash/Recycle Bin and empty it.

If you are ever unsure about a file, use VirusTotal . You can upload the .7z file there, and it will be scanned by over 70 different antivirus engines to tell you exactly what is inside without you having to open it. To help you further, could you tell me: did you find this file? Have you already opened or extracted it? Is your antivirus giving you any specific alerts?

: Open your Task Manager ( Ctrl+Shift+Esc ) and look for any unfamiliar apps consuming high CPU or memory. How to verify files safely