Yeah, i'd learn from this mistake and format the entire drive and start again

To fix Ao hell you'll probably need to uninstall it and reinstall it, then reconfigure the wireless settings.

You've provided no explanation as to what you was trying to do, nor what operating system so all I can concur from what you have done is you had C: and thought "i know, i'll split that and have some room" rather then buy a 2nd hard drive and install it.