My machine is a filthy pit of despair

Egad, I really need to do a better job of cleaning up my work machine. I said I was going to run CCleaner on a more regular basis and failed miserably. Since the new school year is here, I thought I would start things off with a cleanse. Wow, look at the amount of crap that was rooted out of my work laptop? That is a ton of wasted space and some serious leftover junk. Seriously, why do I have 700MB in the Windows logs? What the hell is hiding in there?