Since Microsoft has officially ended support and closed its primary download pages for Windows 7, you can find archived, "untouched" versions on the Internet Archive .
To ensure the integrity of the file you have downloaded or are seeking, verify it against the official Microsoft SHA-1 checksum. If the hashes do not match, the file has been tampered with and should not be used. Official Filename: en_windows_7_professional_with_sp1_x64_dvd_u_676939.iso SHA-1 Hash: 0BCFC54019EA175B1EE51F6A2B207A2D1480E7D8 (Alternative sources list 0BCFC54019EA175B1EE51F6D2B207A3D14DD2B58 en windows 7 professional with sp1 x64 dvd u 676939iso link
After installation, you will need to activate Windows 7 Professional with SP1 x64 using a valid product key. You can do this by: Since Microsoft has officially ended support and closed