Please help!! Macbook 1.1 OS X 10.4.11 Processor: 2 GHz Inter Core Duo Memory: 2GB 667 MHz DDR2 SDRAM The last workable upgrade that I did was build 4486. Every build after that has rendered my VM unusable. Various things happen as soon as I load the upgrade: CPU Usage spikes to 96% to 100% and Windows slows down to a complete crawl. Can take up to 5 minutes to open one application ie Word, Outlook, etc. I continually get "Invalid or Bad Signature" messages. The sound becomes choppy. I have always just gone back to Build 4486 but unfortunately no longer have it. Can anyone please tell me where I can get it in the meantime until I cn get to the bottom of this as my Mac is unusable and has been for over a week now. I am DESPERATE. Thanks in advance