Hi crandt,
Please clarify your OS version. It has installed .net framework 3.5 in windows 7. In windows 8 or 8.1, it has installed .net framework 4.5 or 4.5.1.
Each new version of the .NET Framework retains features from the previous versions and adds new features. The CLR is identified by its own version number. The .NET Framework version number is incremented at each release, although the CLR version is not always
incremented. For example, the .NET Framework 4, 4.5, and later releases include CLR 4, but the .NET Framework 2.0, 3.0, and 3.5 include CLR 2.0. (There was no version 3 of the CLR.)
More info:http://msdn.microsoft.com/en-us/library/bb822049(v=vs.110).aspx
You could follow the steps to open it.
"Control Panel"->"Programs"->"Turn Windows features on or off" and open ".NET Framework 4.5 Advanced Services" or ".NET Framework 3.5(includes .NET 2.0 and 3.0)".
If the .net framwork is a part of OS, you can't uninstall it. Such as .net framework 3.5 is a part of windows 7. So you can't uninstall it in windows 7.
You could use the .NET Framework Setup Verification Tool to verify the installation state of one or more versions of the .NET Framework.
Download from :
http://blogs.msdn.com/cfs-file.ashx/__key/CommunityServer-Components-PostAttachments/00-08-99-90-04/netfx_5F00_setupverifier_5F00_new.zip
More information is in the blog at the following locations.
http://blogs.msdn.com/b/astebner/archive/2008/10/13/8999004.aspx
Regards.
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