Windows Vista Business. Download done twice to make sure that wasn't the problem. Also tried the Error 1935 cures listed in other product posts (cleared transaction log; ensured absence of antispyware / antivrus software / adware; ran setup as administrator).
What is the problem?
There maybe a problem with the .NET Framework installed on your Windows Vista computer. Please see Error 1935 | Assembly component Microsoft.VC80.CRT | Install | CS4, CS5, CS5.5 products | Windows - http://helpx.adobe.com/creative-suite/kb/error-1935-assembly-component-microsoft.html for information on to how to possibly correct the difficulty.