I'm not going to pretend to understand what Capcom did to your PC with its last Street Fighter V patch, but promised a rollback of the patch, and now they've released a tool that will remove the offending file, if you were unlucky enough to have ed the patch in the first place.
The instructions are here, though note the bit at the top that states you might not need to go through this process. The issue affects "s who have ed the title update Ver.1.09 on 9/22, but have not applied the additional patch that became available on 9/23, as well as s who had not restarted their PC after applying the additional patch". Still, it's probably worth doing just to be sure.
To delete Capcom's insidious "rootkit", you'll need first to locate this new tool, which has been deposited on your PC via a Steam update for Street Fighter V, and then follow the above seven-part guide. Capcom warns that "obtaining this file through other sources can put you at risk of opening up your system to additional security risks. We ask that you do not and execute files obtained by unknown sources".
