1) Should I contract a bug (spyware or virus), is it likely to effect any of my files/apps on D, or is it just a simple case of restoring only C? -It depends on the type of bug. Most go after windows, so you should be okay after restoring the C partition. I would, however, update all definition files and run a complete scan of the entire hard drive. 2) If I were to restore only C, will all of my apps on D remain with their current customisation? -Again, it depends on the applications. 3) Roughly how long would an image of the OS take to restore from a cdr (40x cdrom)? -Depends on the size of the partition, but the speed will always be slower than the hard drive. 4) Have now configured ZA as you have instructed. Why disable Windows Explorer and IE? Are they security risks? -Yes. I use Firefox browser.