Originally Posted by Mr_ELiiTe
yes it wont open
( i wanted to mod my GS)
but it wont open
Right, I understand your error more now.
First try disabling your firewall / anti-virus that could be blocking it.
Also make sure your have the latest version of .NetFrameWork. (3.5 is fine)
Also, when you downloaded Horizon did you fully finish the download?
It may be corrupted. unlikely, but try it.
I won't go through all the lists of what to do but try those then contact me, I will help you until it will work.
And one more thing.
You need diamond membership to mod your gamerscore.