Seems broken. This one works better: http://www.exploit-db.com/exploits/15203/
Couple of points:
This is meant to be run on Windows, so compiling it with gcc and trying to run it on Linux will fail. So you have two options: compile it on Windows, or figure out how to compile it on Linux (hint: read up on mingw)
Lots of exploits are designed to be broken to prevent script kiddies from using it... or worse, the shellcode could be be designed to wipe out your system or open a backdoor. Learn to create your own shellcode (hint: read up on msfvenom and msfpayload).
For instance, that exploit you found could have been easily generated with msfvenom:
msfvenom --payload windows/adduser --format exe > adduser.exe
Also, in order for the exploit to work, the user running it needs to be part of the Administrators group (or SYSTEM). Otherwise you'll just get an access denied error. So it makes more sense to use it as shellcode for an exploit.
Finally, you seem relatively new to this, so unless the machine you're targeting is your own, I suggest treading carefully. Doing things blindly can cause more harm than good.