What do I do when Steam is acting up while I'm trying to activate my keys?

Steam on my laptop seems to work 35% of the time. Trying to get it to do anything but show me my Games Library page is a crap shoot. Getting it to load and connect in the first place is a hit-or-miss, and I've won two keys and it's getting to be a hassle to get them freaking activated. I don't want to be banned again for not activating the shit I've won!! I learned my lesson the last time, believe me! ヾ( •́__•̀ ;)ﾉ

Is there a place to activate keys on Steam in my browser that I'm not aware of?

This has lately become a regular occurrence and my friends don't really have any ideas, and the Steam forums are a bit vague as to what to do. I mean, I don't live out in the middle of nowhere: Internet is fairly okay, rarely bugs out unless there's a storm or bandwidth is being eaten up by the family watching Netflix.