Cinemapro1-2, Firefox (Already tried the solution given here): New Macbook

Please open the Library folder in your home folder by holding down the option key and selecting

Go ▹ Library

from the Finder menu bar. Navigate in the usual way to the item indicated.

Isnt it supposed to reset to factory defaults?

No. Reinstalling in place only replaces the files that are part of OS X. All other files are unaffected, with a few exceptions.

If you've done what you say you did, it has already been reset to factory condition. I must say, though, that if you installed malware in the first three hours, you need to be much more cautious about what you download.

Until you have more experience as a Mac user, I suggest you change a setting to allow only Apple updates and software from the App Store to be installed.

Open the Security & Privacy pane in System Preferences and select the General tab. Click the lock icon in the lower left corner and enter your password to unlock the settings. Select the button marked

Mac App Store

and close the preference pane. For information about the effects of this setting, see this support article. You may need to change the setting temporarily to install some third-party software, such as Flash Player. Be especially careful with that, as malware is often distributed in the form of a fake Flash update. Never follow a link to a Flash update on any web page. Instead use the built-in updater in the Flash Player preference pane.

The products in the App Store, while they aren't always very good, can at least be considered safe enough to use.