Once you install an image onto a PC, it does not matter how it got there to the computer and hard-drive, it will allow that PC to be imaged again. I do this all the time during testing. Image a base build, install stuff, test, image the new build, and so on. The issues you were having were probably something else, not related to the actual act of imaging. Maybe you had a hardware conflict between the systems, or a different chipset or drive controller issue.