I am running Windows 7 64 bit installed from an .iso mounted on a CD. Since SP1 has been available, I have been unable to install it via Windows Update and directly downloading it from the website.
Recently I downloaded a program that required .Net 4.0 but was unable to install it as well. I checked Windows Features (via Add/Remove Programs) and found .Net Framework 3.5.1 was turned off. Clicking on it and both of its components (HTTP and
non-HTTP) produces the error message: "An error has occurred. Not all of the features were successfully changed." Clicking on the .Net 3.5.1 alone will produce the same error.
Microsoft .Net Framework 3.5.1 does not appear in the Add/Remove Programs list, nor does any previous version of .Net Framework.
I used a
.Net Framework Cleanup Tool to try and wipe 3.5.1 and start over. I downloaded and successfully installed .Net 1.1. .Net 2.0 reported that it could not be installed because a version of it was already installed in the OS. .Net 3.0 reported
that a newer version of the .Net framework was installed. .Net 3.5's executable file opened but did not run. After this, I used the
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