Which .NET framework to remove?

In my "Add/Remove Programs" I have :

Microsoft .NET Framework 1.1

Microsoft .NET Framework 1.1 Hotfix (KB928366)

Microsoft .NET Framework 2 Service pack 1

Microsoft .NET Framework 3 Service pack 1

Microsoft .NET Framework 3.5

I am useing Microsoft VB .NET 2008 express edition and wanted to know which versions on .NET Framework would it be ok for me to remove.

Thank you for answering

Which .NET framework to remove?microsoft vista

You need all of them to run.

Uninstalling an earlier version will cause the newer ones to also uninstall or stop working.

Which .NET framework to remove?windows xp pro internet explorer

Why remove any? An updated OS should have them all on (mind you i dont think 3.5 auto installs)
Remove everything except 3.5 .