This week's book giveaway is in the Agile and other Processes forum. We're giving away four copies of The Mikado Method and have Ola Ellnestam and Daniel Brolund on-line! See this thread for details.
Completely freezing up? Could be any of you hardware components - bad RAM, faulty power supply, bad NIC, overheating CPU or GPU, etc.. Follow standard hardware debug procedures: remove/replace to locate the faulty part. You might also consider cleaning out the inside of your case.