In looking through other posts i came across one form Phillip_Yip:at the bottom of this thread:[URL] which lead me to this:[URL]#Windows7SP1Techbench   I was able to download the .iso , install and activate using the Key from my COA. Great success !
I have an XPS Studio 8100 wherein the HDD went bad.  Drive is replaced but i need to reinstall the OS Windows 7 Home Premium 64-bit. I tried using the Dell OS recovery tool but it states, for the service tag:  "No OS Images Defined for this product". Though the driver page accepts it fine. I have searched around and am currently downloading the ISO from Microsoft using a tool I found as posted by Phillip Yip. But I need to know how to proceed correctly. Or any other suggestions.  
XPS Studio 8100, OS image, Windows 7 Home Premium