Ok, I think I see part of the problem. C:\Windows is a less-than-ideal location to copy your files to. This was the default in SAPGUI 6.40 and older, but it is problematic in any OS from Windows Vista and later, so starting with SAPGUI 7.10 the default location is changed. With 7.30 you should use the folder you are discussing, %APPDATA%\SAP\Common. Don't try to copy anything to C:\Windows. If you do, in Windows 7 you're likely to see it copied to %LOCALAPPDATA%\VirtualStore\Windows, as Windows will typically prevent programs from writing to C:\Windows.
Instead, have your package event script copy the files directly to %APPDATA%\SAP\Common. Also, make sure that the source location that you are copying the files from is in a folder called CustomerFiles that is directly under the shared root of your Installation Server, i.e. if your Installation Server is installed to \\server\sapguishare, then the source location is \\server\sapguishare\CustomerFiles. This is especially important if you are trying to use Single-File-Installer packages, although you don't actually need those for SCCM deployments. You just need a regular package, with appropriate scripting, and a PDF file that you create with the NwSapSetupAdmin tool.