Microsoft released a "System Update Readiness Tool" specifically to fix corruption that prevents SP1 from installing.
Pushing the update to multiple PCs via a flash drive or local network.
Service Pack 1 for Windows 7 includes:
Before installing the x64 version of SP1, ensure your system meets these criteria:
If another admin sysprepped an image using b78b8e95... as the SP1 marker, and you attempt a fresh deployment without that exact GUID in your source, Sysprep will fail with error 0x80300002 .