Now what should i do? Is my system infected with some sort of virus?
If you've got crypto wallets and they're encrypted with a strong password, they're likely only going to become unsafe if you try to decrypt them. If you have nmemonics you could make a new account on a phone, hardware or an exchange and send the funds there but there's no reason to rush this.
What do.you expect to do? Have you used the system much since then? Have you checked the file's metadata to see if there's anything about who might have made it, do you have antivirus installed (they might be able to run scans for its heuristics).
This list of things you can do extend from deleting and reinstalling your system to backuping your system using a live os like Ubuntu (onto an external drive) and the.not using that drive unless you have something you desperately need and can reinstall your os afterwards to running a backup if you want and risking the results of just continuing to run a potentially infected system.
If you can help it, don't shutdown your machine from this point or restart it for a while as this activates a lot of viruses that would otherwise remain dormant (instead, if you must, use hibernation or sleep - you can access the menu by using alt+F4 on your "desktop" - the screen that shows when all apps are minimised).
Stop running admin accounts when you don't need to if there's a chance you'll do something like this is possibly a great place to end...