I ruined my Mac OS

I'd spent an hour yesterday grabbing a copy of VMWare image that contains Mac OS 10.5.5, then I installed the iPhone SDK for 6 hours! Eventually I'd the software upgrade and installed the 700+MB Mac OS 10.5.7 Combine Update and found that it killed the virtual machine. Total time lost was half a day!

Luckily I got a backup copy of the initial image. That's mean I will have to spent another 6 hours to install the SDK.

Update: The Mac OS image mentioned above is done by Xelabo, however I just came across an image that has 10.5.7 update in it. There is a forum discussing about increase performance and upgrade here.