Run a full scan with your antivirus software (if you don’t have any other provider’s anti-virus software, you can use Microsoft Defender which is built into Windows - search for “Virus & threat protection” in the Start menu, click on “Scan options” and select “Full scan” and then click the “Scan now” button.

Once that is done I’d suggest running an anti-malware app like Malwarebyte’s Anti-Malware.

There’s still a risk that even after both of these that you may still have a virus or malware on your PC, so really the safest option would then be to back up all your files and any data such as Favorites, and then wipe and reinstall Windows.

Try running 2 simulations at once if you can

I would actually suggest against this, at least on a laptop. One of the biggest limitations with laptops is thermal (i.e. cooling), and increasing the load on the processor will increase the heat it produces and make it more likely that the more aggressive (than desktop or server-orientated processors) thermal throttling will kick in and reduce the processor frequency causing both instances to take longer. It may be possible to still get processing done with them both running, but I wouldn’t count on it.

Really it would be better for OP to build a PC/server designed for this task than trying to do it with a laptop.