Hello everyone! I've had my iMac since early 2008 (2.8GHz, 4GB RAM, nice NVidia card) and it has ran great until recently. Things seem slow, and take a bit too long to open. Even worse is that its performance is inconsistent. Sometimes iTunes can take 6-8 seconds to load, and sometime 30 or more. I had concluded that this is due to my hard drive being almost full (320 gigs). However, I erased about 50GB of info, and it still performs about the same. The bump to Snow Leopard helped a bit, but the performance still isn't near where I'd like it to be. I also just installed 4GB of RAM. So a new idea is to just completely erase everything and start over. I have a time machine backup of all of my info, and I would selectively add old information to the newly formatted drive (things like movies, photos, apps). However I have two problems in doing a full erase (or whatever the technical term is) 1) What happens to preferences and the such? I have my iPad and iPod touch synced to my iMac and I don't know how that would affect them after I tried to sync them after the erase. Also, if i load all of my photos back into iPhoto, will events and albums need to be reconfigured? 2) What happens to my Windows Vista partition? I have a 30GB partition for Vista, and what would happen to it? Would OS X be smart enough to not touch it? Thanks for all of your help!