Microsoft .Net Framework
Microsoft .Net Framework version 2.0 has been provided with Windows since mid-way through the Windows XP production era, so most likely it is already installed on your computer along with several other versions.
You can check for the .Net installation on your computer. Just look under your Windows directory for the sub directory_
"..Windows/Microsoft.NET/Framework/v2.0.50727"

If you don't have it, you can_
download and install the framework (version 2.0, x86) and the service pack
- directly from Microsoft (Recommended) or
download and install the framework and service pack files from this site.
In either case, install the framework first, then the service pack.