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For Windows XP/2003/Vista/2008/7/2008R2
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.NET Framework 3.5 SP1		(this will install the .NET Framework 2.0 SP2 and 3.0 SP2)
.NET Framework 1.1		(not used by ACA software)
.NET Framework 1.0		(not used by ACA software)
.NET Framework 4.0		(use the FULL install, not the Client install)

DO NOT INSTALL .NET Framework 2.0 or 3.0 using their own installers - use .NET Framework 3.5 SP1 instead

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For Windows 8/2012:
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.NET Framework 3.5	\	(.NET Framework 3.5 includes the .NET Framework 2.0 SP2 and 3.0 SP2)
.NET Framework 4.0	 > are all installed using 'Programs and Features' - 'Turn Windows features on or off'
.NET Framework 4.5	/
.NET Framework 1.1		IS NOT SUPPORTED
.NET Framework 1.0		IS NOT SUPPORTED