I just cant register the uploadimghd.dll

Hello i have downloaded the zip files of the Uploading, Determining Size, Width and Height and Resizing Image Files with ASP.NET, but the problem is i just can't register the dll files. \
I everytime i start the command prompt and get to the directories where the imgupload.dll is residing is says the specified module could not be found. Please help me i really want this script. I have been serching the net for such script and this is the one that i am looking for.