yeah but it went when I wiped my laptop (I needed to factory format)
What you may need to do is continue updating (Windows Updates) your current operating system until the GWX.exe icon reappears.
Depending on how you "wiped" your laptop a "factory format" or factory image recovery may no longer be available to you if the factory image partition is no longer present or is empty on your hard drive.
What you might consider doing instead, if a factory refresh is your objective is to contact the laptop manufacturer and see if they will provide you with recovery media in the form of DVDs.
Most will, if under warranty it is generally free, if not then there may be a nominal fee.