I deleted the SystemConfiguration folder on OSX Yosemite and now my computer won't reboot.

I need some help. My WiFi connection kept disconnecting all the time so I looked on here and saw that you could fix the problem by following these steps
Navigate to /Library/Preferences using either method:
Terminal: open -a Finder /Library/Preferences
Finder: Open New Finder Window -> "Go" -> "Go To Folder ..." -> [ Type In: /Library/Preferences ]
Backup the folder "SystemConfiguration" by copying it to your Desktop.
Delete the folder as it sits in /Library/Preferences.
Done.
I didn't back up my SystemConfiguration folder and now my computer won't start up again. It gets frozen halfway on the reboot screen.
I don't know what to do. Please help.

Hello Tian10an,
Do you have TimeMachine backup? If so you could try to recover(⌘+R) to the last available one.
Unfortunately other than that the only option for you seems to be reinstalling the OS.

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