Same problem. I have CC installed on Win 7 with all other apps working fine. Tried to install Lightroom 5 and got:
Exit Code: 7
Please see specific errors below for troubleshooting. For example, ERROR:
- 0 fatal error(s), 3 error(s)
----------- Payload: Adobe Photoshop Lightroom 5 5.7.0.0 Adobe_Lightroom_x64.msi_5.7 -----------
ERROR: Error 1935.An error occurred during the installation of assembly component {5C21D397-1DA5-
3749-8C1F-165F21DE9E3E}. HRESULT: 0x80070003.
ERROR: Install MSI payload failed with error: 1603 - Fatal error during installation.
MSI Error message: Error 1935.An error occurred during the installation of assembly component
{5C21D397-1DA5-3749-8C1F-165F21DE9E3E}. HRESULT: 0x80070003.
ERROR: Third party payload installer Adobe_Lightroom_x64.msi failed with exit code: 1603
I uninstalled all Adobe CC software, ran Adobe CC Cleaner, cleaned my Registry using Piriform CCleaner 5, rebooted and reinstalled CC from scratch. Same problem--everything else installed correctly except Lightroom 5. Also tried uninstalling KB2918614--no joy.
Dayton