The Windows Vista SP1 x64 .ISO file is now online in the TechNet Subscriber Downloads center. It's the fully integrated SP1 thus allowing you to install the operating system from scratch. Although it says English, it's my understanding it includes French, German, Japanese and Spanish as well.
en_windows_vista_with_service_pack_1_x64_dvd_x14-29595.iso ISO-9660 DVD Image
This file contains the following:
- Windows Vista™ Business with Service Pack 1
- Windows Vista™ Home Basic with Service Pack 1
- Windows Vista™ Home Premium with Service Pack 1
- Windows Vista™ Ultimate with Service Pack 1