Windows and Office Genuine ISO Verifier – this program will help owners of Windows or Office images find out whether they have a genuine copy or not. To do this, all you need from us is to specify where this image is located on your hard drive, then click on the green check mark and wait for the scan to finish. After that, the SHA-1 checksum will be subtracted and below it there will be a verdict, actually on the third screenshot you can watch it. The utility works with Windows XP and Office 95 and higher. As I understood, the author has a database of genuine hash sums with which he simply compares what you indicated, it’s all very simple.