Recently I've had a few calls regarding the installation of Windows XP SP3 (Service Pack 3). In general it's always a good idea to upgrade your Windows installation with at least the major and important updates. Before attempting an install of Windows XP SP3 on a Mac though, you should create a backup of all your files.
Because some systems simply won't start into Windows again after updating. Performing a repair can be pretty tricky because Windows is running on a virtual hard drive. If you have one of the newer iMac's you may also have problems using the wireless keyboard during a repair operation.
This is pretty common, especially on the newer iMac's. This is due to the hard drive configuration in OS-X! The problem is related to the reboot, where Windows SP3 can't find the C-Drive, thus the installation halts with an error code. I have a small script you can run, that changes the settings of Windows during the reboot, which should solve the problem.
Common error code: "Not enought disk space".