I keep breaking Fedora 17 (help! boot issue)

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http://forums.fedoraforum.org – Okay so I'm fairly new to linux..I use RHEL at work but on a basic level but recently i've decided to dual boot Windows 7 and Fedora. Easy, no problem. The real issue is I keep messing it up once i'm up and running every time! (last time I think I ruined all permissions and boot was hanging and just decided to restart) This time i'd like to troubleshoot it a bit more and as I'm a noob in LInux i'd grealy appreciate your help. All i remember doing was running updates, changing the logon screen in beefy-miracle.xml and also trying to install javascript and flash. I remember installing OpenJKD (HowTos)