Check the SHA-1 hash of the file against known official hashes to ensure it hasn't been tampered with. 3. Dell/HP Recovery Portals If you have a branded laptop: Visit the manufacturer's support site. Enter your Service Tag or Serial Number .
Install a robust third-party antivirus, as Microsoft Security Essentials is outdated. Conclusion download free windows 7 iso
Restart your PC and press F12, F2, or ESC to enter the Boot Menu. Check the SHA-1 hash of the file against