The installation of the .NET framework failed and needs to manually delete the solution:
The following steps will remove the .NET framework after the .NET framework is installed, and allows new installations. Do not remove the beta .NET framework from your computer. If the Beta .NET framework is installed, it can be removed by reforming the hard drive.
WARNING: "Registry Editor" can cause serious problems, these issues may need to reinstall the operating system. Microsoft does not guarantee the problem that the "Registry Editor" uses improper use. Use Registry Editor at your own risk.
If you have an entries in the .NET framework in the Add / Remove program, delete the .NET framework. Search for Mscoree.dll files and rename the file (if present). Mscoree.dll should be located in the Windows Directory / System32 folder. Remove the UrtTemp folder on Windows Directory / System32 / Syst / System32 / click Start, click Run, type regedit, and then click OK to launch the Registry Editor. Delete the following item: hkey_classes_root / installer / product / aa75334bd6a349d45be6344cd4905e84
HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / .NET Framework
HKEY_LOCAL_MACHINE / SOFTWARE / Microsoft / Net Framework Setup
Restart your computer. On the Start menu, click Run, type NET Stop iisadmin, and then click OK to stop the Internet Information Services (IIS) Admin service. Delete the Windows Directory / Microsoft.net folder. Important: This article contains information about modifying the registry. Before modifying the registry, you must back up the registry and must know how to restore the registry when there is a problem. Information on how to back up, restore, and edit registry
