Your only option to verify if the ISO is genuine or not is to check its MD5 or SHA-1 checksum from Microsoft. You can still search for its ISO copies on other websites but the thing is you are not sure if they are genuine or counterfeit.
Unfortunately, after Microsoft discontinued support for Windows XP on April 8, 2014, all legit copies of Windows XP ISOs have also been discontinued to be offered as downloads. Free download of Microsoft Windows XP sp1 iso.
