itsVance :
You probably don't need to 'reset' your laptop. Call your internet service provider, they will have tech support standing by to walk you through fixing the problem.
TOTALLY BAD ADVICE HERE, note OP said "error messages saying required drivers are missing" that has nothign to do with your Internet provider.
What ASUS is telling you, and you may be out of your league to understand it (it is okay
) is you need to use the RESTORE AND RECOVERY DVDs that came with the system to WIPE IT CLEAN and put it back to how ASUS sold it to you. Yes you would lose all your data, especially if this is Windows 8, which REQUIRES a Internet Connection. If this was NOT Windows 8 I would suggest getting a external Hard Drive ($49 Walmart) then run Windows Easy Transfer and backup your data, THEN do the restore DVDs. But Windows 8.1 does NOT support that anymore, all such 'backups' are online to Microsoft servers (your Live! account).
If this is all too over your head, stop now, take everything that came in the box, put it in the box and bring it to a local Mom and Pop Tech store for them to help get you squared away.