Some suggestions:
1) Check Programs & Features for any added item regarding this that can be removed.
2) Uninstall Windows Live Mail & then re-install it from the WL Essentials package installer. it is possible a 'clean', fresh installation of WL Mail will no longer have this thing in it (anymore).
3) System Restore could be a solution; take it back to before he did this.
4) Run Malwarebytes
As an aside, just cus I'm a curious sort & cus it's a Dell that likely came bundled w/ (lovely) Norton... if I'm right, you might consider dumping Norton & going w/ MSE, instead & the W7 (OS) Firewall.
Anyway, to get back on track, your WL Mail should not be running w/ whatever he did running in it, you're quite right about that part.
Cheers,
Drew