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I was checking my disk D and I've got System and System 64 folders. There was also some folder called "mono" but I deleted it because it was empty. I have no idea how it could appear in there. I don't think that it might be virus since I checked my pc with my antivirus, but maybe it is? These folders are full of .api apps.
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Answer accepted by question author
Hi Anastasia
I am Dave, I will help you with this.
Rest assured, those folders are not malware, they are usually created by a game or Unity Engine
Do you have SCP: Secret Laboratory on Steam installed on your PC?
if you do, then that created those folders on your D drive.
