Avast pulled up a warning notification when I started my computer up - Win32:Trojan-gen
It gave me the option to reboot scan, so I did. It found the infected file, and a list of options appeared. The Delete or send to vault options wouldn't work. It said something like "system operation invalid." I had no option but to exit the scan.
I attempted to download Malwarebytes Anti-Malware, but Avast stopped the download.
I'm not sure how to go about removing this.