ghost recon is not installed? reg help needed

[bloodright20]

ok i have ghost recon and its addons but for some reason when i install ghost and then try to installl the add ons it says ghost recon is not installed i asked for help but thay just told me to keep reinstalling it i dont want to sit all day and keep trying till it takes that blows. so can i use a reg editer to make a key that will tell the dame comp that its installed if so how i have no idea how to do it