Heyyo,
Anyways, HaloPC preforms like crap on high rez, even with new comps. Gearbox messed up bad, thus we get a bad halo experience... diddn't help any that m$ did that time constraint.
Anywho, you should just be clicking ok to go back some screens n' such. If that keeps failing, you might have an error with your profile, try creating another one and see if that one works ok.