| Edition | SHA-1 Checksum | | :--- | :--- | | Windows 7 Ultimate (x64) – SP1 | 36AE90DEFBAD9D9539E649B193AE573B77A71C83 | | Windows 7 Professional (x64) – SP1 | 501DD150B71C4A9E5F03CBFB1A64B1D8BCCB5D63 | | Windows 7 Home Premium (x64) – SP1 | 6C9058389C1E2E5122B7C933275F963EDF1C07B9 |
| Site Type | Examples | Risk Level | Notes | | :--- | :--- | :--- | :--- | | Internet Archive | archive.org/details/Win7_ISO | | Files are static; check SHA-1 checksums against official MSDN hashes. | | Tech Forums | MDL (My Digital Life), Reddit | High | User-uploaded; often bundled with activators (malware). | | Torrent Sites | Pirate Bay, 1337x | Very High | High probability of rootkits, miners, or pre-installed backdoors. | | "ISO Downloader" Tools | Heidoc ISO Downloader | Low-Medium | Tool is legitimate but downloads from Microsoft’s old Akamai cache (may still work). | windows 7 64 iso
Never download an ISO from an unknown blog or file locker (MediaFire, Mega, Google Drive) unless you verify the SHA-1 checksum against a trusted MSDN reference table. 5. Official SHA-1 Checksums (Reference) To verify an ISO is unmodified, compare its SHA-1 hash. Example for US English (en-us): | Edition | SHA-1 Checksum | | :---