I tried disabling the groveler service on the RIS server and it didn't solve the problem. I don't understand, everything worked fine until that set of images. I made about 10 images before that one and I never had any error message. I'm not using any AutoRIS or AutoImage. I'm just working with the standard Microsoft tools (RIS and Riprep). So, except for RogueSpear , is anybody willing to make a suggestion as to how I can solve this problem?