Hello NSADAKA,  Please make sure that you use the OEM copy of Windows before you begin. I have pasted a link below for some instructions on how to capture your WIM file using a VM.  [URL]
Hi, We are currently looking to update our existing reference image from Windows 7 to 10 and would like to use Dell's image assist tool for the creation of xml files, capture etc. I have created a win10 install using VMware and setup my changes etc but when it comes to loading the image assist tool i get this error message: [IMAGE] is there any way around it this? Any assistance would be useful at this point. 
Difficulty with installing image Assist