I don't know how this program got on my machine, but it is giving me nothingn but grief. How do I get it off my computer along with Mystart.com? They are not in my control panel or anywhere else I have looked.
nginx is a free and open source web-server.
nginx is not installed on your computer. A virus (a DNS Changer) is redirecting some pages you open to a alternate location, and that alternate site runs nginx. Because there is no website set up at the alternate location, you see the default 'Welcome to nginx!' page.
I don't know about those particular files, but in general, on a Windows system you can simply use the desktop "search" to find the files and delete them. If these are malicious programs, though, you risk the running program doing any kind of malicious acts in retaliation, including erasing your hard drive. Better to run msconfig.exe first, click the "startup" tab, and disable anything questionable from starting up. The same goes for the "services" tab but you have to be more careful there. I remember running into viruses that had a service and a "startup" program in conjunction, one replacing the other if one got deleted. After disabling the evil programs from starting up, reboot, check again to make sure they're not running, and delete them. But first make a backup of all your important data... just in case.