What are the various .NET Framework softwares for? Are any non-essential?

[AWS]

My computer has currently installed:

 

.NET Framework 3.0 SP2 208MB

.NET Framework 3.5 SP1 28MB

.NET Framework 4 Client Profile 182MB

 

These require a lot of memory compared to Windows XP (220MB)

 

Further, every time I shut down, the system tries to install 2 updates - but possibly fails each time(?). I suspect one of these relates to Framework 3.5

 

Can someone help me sort this out?

 

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