Hi, I am a PC guy, in IT actually but I have never really used a Mac desktop. My sister has an iMac. It has gotten slow, disconnects from wifi sometimes. She wants me to backup the data, erase it and reinstall the OS. While doing this she wants to go to the latest OS if possible, maybe add some memory. So, I am coming to the experts to ask some questions... First, here are the specs of what she has now: iMac 7,1 Intel Core 2 Duo 1gb RAM MAC OS X 10.5.8 Based on this, what is the best OS this hardware could handle? Would it be worth adding more RAM to get to a better OS? Any other info or suggestions? (no she does not have money to get rid of this thing or buy a new one..at the very least I will erase it, reinstall the same OS it currently runs and then restore her data). Thanks!