| Possibility | Likelihood | |-------------|-------------| | A corrupted or modified Windows 7 SP1 installer | Medium | | A third-party patch or “repack” | High | | Malware disguised as Windows 7 SP1 | Medium–High | | A custom-built driver or system file | Low | | Typographical error or fake hash | High |

Installing SP1 for Windows 7 is a straightforward process: