Yesterday, I went to my Recycle Bin (for the first time in a while) to purge a bunch of files I had sent there. When I clicked on the folder, my antivirus warned me of a trojan out of the blue. Later, while moving my folder for NetHack to a USB, my antivirus also warned me of a trojan among the files there, which I frankly found odd.1 (I would consider the developers trustworthy, at least, although perhaps the site they host their installation on isn't.)
With this in mind, I ran a full scan of my computer, which came clean, apart from a few web trackers and the two trojans that had come up earlier. These were all deleted. (Being paranoid, I ran a second scan afterwards; the scan indicated that my computer was fine.)
Can I reasonably assume that my computer is fine now? I don't think I have the resources to boot from a back-up, so I rather avoid doing something of the sort unless absolutely necessary.
- I'm not sure where these files came from. I try to be careful with my computer usage habits, but I suppose it's possible I got something when I ran into some sketchy sites.