What is causing my disk C to appear falsely full?

M

mathews mwiti

Hi Community. My name is Matt and I did a Treesize scan on my personal computer to find out what was occupying around 420GB of my disk space making my disk C almost full. I found a very large file (around 420GB) by the name "system.exe" created in the location "C:\Users\"user name"\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup"Where did this file come from and how may I prevent it from reoccurring considering the fact that I already have Kaspersky antivirus installed? How was it created and is it malicious? If malicious what does it do to my PC? Below is a link for the screensh

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