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Some clarification with you
What is your OS?
If your OS is Windows 7 or Vista, I would provide some suggestions with you.
- You could install the latest .NET framework version (.NET Framework 3.5 SP1 or 4) on your machine.
- .NET Framework 3.5 SP1 is including .NET Framework 2.0 SP2 and 3.0 SP2.
- The .NET Framework 2.0 Service Pack 2 provides cumulative roll-up updates for customer reported issues found after the release of the .NET Framework 2.0.
- .NET Framework 1.1’s CLR and .NET Framework 2.0’s CLR are quite different.
If you have a special necessary for project, you could certainly install .NET Framework 1.1 on it.
You could refer the following link, which talks about how to install .NET Framework 1.1 on Windows 7.
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