i have a few programs that require .NET framework 3.5 to run but it seems they do not run on Windows 8. Is there a problem with my program or the windows 8 do not support .NET framework? Any help?Â
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By default, Windows 8 comes with .NET Framework 4.5 RC installed in your computer . However, .NET Framework 3.5 needs to be installed manually since it does not include in Windows 8.  This is the reason why you are not able to run your program. In order to solve this, you can either enable the .NET Framework 3.5 in your Control Panel or install the .NET Framework 3.5 on demand while attempting to run the application which requires the .NET Framework 3.5 . Both of these require an Internet connection to be completed.
Installing the .NET Framework 3.5 on Demand
When you are running an application which requires the .NET Framework 3.5 enabled on your computer or either you are running it for the first time, the following message will be prompted :
Choose Install this feature in order to enable the .NET Framework 3.5
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Enabling the .NET Framework 3.5 in Control Panel
You may also enable  the .NET Framework 3.5 on your own in Control Panel. Open your Control Panel, select Programs and Features, select Turn features on or off and finally check Microsoft  .NET Framework 3.5 checkbox.
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I hope this information will help you . Thanks.
There’s no problem with your programs because the problem is with your operating system. If the applications on your computer or the ones you want to install require Microsoft .NET Framework 3.5 and you’re on Microsoft Windows 8, that’s a big problem. Even if your applications or the ones you want to install support Windows 8, the required .NET Framework 3.5 does not support Windows 8.
There’s no way you can install Microsoft .NET Framework 3.5 on Microsoft Windows 8. The highest version of Microsoft Windows that supports .NET Framework 3.5 is Windows Vista. From Windows 7 and higher, Microsoft .NET Framework 3.5 is not supported.
If your machine is fast enough to simultaneously run two operating systems, you can install Windows XP or Windows Vista on a virtual machine and run your applications from there. That’s the only viable solution if you want to install Microsoft .NET Framework 3.5. If you want to download this .NET Framework then download Microsoft .NET Framework 3.5 Service Pack 1 instead.
