• What is Microsoft .NET Framework?
  Pronouce it "Microsoft dotnet framework".
  This is a set of files. These files offers many services. To make a comparison, Windows offers many services to your computer box. Microsoft .NET Framework offers many services to your Windows.
  More and more software will need .NET Framework installed to run.
   
• Is it secure to install this framework on my machine?
  Before releasing .NET Framework 2.0, Microsoft worked with 5000 beta testers during one year. Beta test focused on stability and security. .NET Framework 1.1 is included in "Windows .NET 2003 server" so today it's widely used.
   
• How many space .NET requires?
  Microsoft indicate it needs 280MB of disk space to install it. .NET doesn't use memory (or RAM) when it's not used (i.e. when url2jpeg doesn't run)
   
• Can I uninstall Microsoft .NET Framework?
  Yes, go to Add/Remove programs. Because .NET Framework only uses disk space, I advise you to keep it installed even if you remove url2jpeg.
   
• How do I know if .NET Framework is not already installed on my machine?
  Go to Add/remove programs and look if "Microsoft .NET Framework 2.0" is present in the list of installed programs. You can also try to install url2jpeg, it'll warn you if .NET Framework 2.0 is not installed.
   
• Do I have to uninstall .NET Framework 1.0 or 1.1 before installing .NET Framework 2.0?
  No, each version of .NET Framework are independent. Keep the previous version, you certainly use it.
   
• Honestly, what is the risk installing .NET Framework 2.0?
  There is no risk. Sometime the Framework refuse to install but this is very exceptional and doesn't jeopardize your windows.