清除windows 系统中 任意已安装任意版本的 .NET Framework
最近在公司电脑上遇到难题，政府部分的软件和.net framework冲突，不好安装。在网上找了好久，发现这个软件，分享一下：
.NET Framework Cleanup Tool
本人实验，本人电脑windows 8.1中 装了3个版本，选中任一个要删除的版本号， 点 CLeanup 即可以。
软件下载地址： http://www.400gb.com/file/98576027 ，因本人没有空间可以存，所以用免费空间,有广告弹出，见谅,或者在百度里搜索下载也可以的。
以下为摘录自MSDN官方的介绍：
.NET Framework Cleanup Tool User's Guide
Introduction
This .NET Framework cleanup tool is designed to automatically perform a set of steps to remove selected versions of the .NET Framework from a computer. It will remove files, directories, registry keys and values and Windows Installer product registration information for the .NET Framework. The tool is intended primarily to return your system to a known (relatively clean) state in case you are encountering .NET Framework installation, uninstallation, repair or patching errors so that you can try to install again.
There are a couple of very important caveats that you should review before using this tool to remove any version of the .NET Framework from your system:
This tool is designed as a last resort for cases where install, uninstall, repair or patch installation did not succeed for unusual reasons. It is not a substitute for the standard uninstall procedure. You should try the .NET Framework Repair Tool and then try the steps listed in this blog post before using this cleanup tool.
This cleanup tool will delete shared files and registry keys used by other versions of the .NET Framework. If you run the cleanup tool, you will need to perform a repair/re-install for all other versions of the .NET Framework that are on your computer or they will not work correctly afterwards.
Additional support can be obtained by visiting the .NET Framework setup forum at http://social.msdn.microsoft.com/Forums/en-US/netfxsetup/threads.
Supported products
The .NET Framework cleanup tool supports removing the following products:
.NET Framework - All Versions
.NET Framework - All Versions (Tablet PC and Media Center)
.NET Framework - All Versions (Windows Server 2003)
.NET Framework - All Versions (Windows Vista and Windows Server 2008)
.NET Framework - All Versions (Windows 7)
.NET Framework 1.0
.NET Framework 1.1
.NET Framework 2.0
.NET Framework 3.0
.NET Framework 3.5
.NET Framework 4
.NET Framework 4.5
.NET Framework 4.5.1
.NET Framework 4.5.2
Not all of the above products will appear in the UI for the .NET Framework cleanup tool on every operating system. The cleanup tool contains logic so that if it is run on an OS version that includes the .NET Framework as an OS component, it will not offer the option to clean it up. This means that running the cleanup tool on Windows XP Media Center Edition or Tablet PC Edition will not offer the option to clean up the .NET Framework 1.0, running it on Windows Server 2003 will not offer the option to clean up the .NET Framework 1.1 and running it on Windows Vista or Windows Server 2008 will not offer the option to clean up the .NET Framework 2.0 or the .NET Framework 3.0.
When choosing to remove any of the above versions of the .NET Framework, the cleanup tool will also remove any associated hotfixes and service packs. You do not need to run any separate steps to remove the service pack(s) for a version of the .NET Framework.
Silent installation mode
The .NET Framework cleanup tool supports running in silent mode. In this mode, the tool will run without showing any UI, and the user must pass in a version of the .NET Framework to remove as a command line parameter. To run the cleanup tool in silent mode, you need to download the cleanup tool, extract the file cleanup_tool.exe from the zip file, and then run it using syntax like the following:
cleanup_tool.exe /q:a /c:"cleanup.exe /p <name of product to remove>"
The value that you pass with the /p switch to replace <name of product to remove> in this example must exactly match one of the products listed in the Supported products section above. For example, if you would like to run the cleanup tool in silent mode and remove the .NET Framework 1.1, you would use a command line like the following:
cleanup_tool.exe /q:a /c:"cleanup.exe /p .NET Framework 1.1"
One important note �C as indicated above, the cleanup tool will not allow you to remove a version of the .NET Framework that is installed as part of the OS it is running on. That means that even if you try this example command line on Windows Server 2003, the tool will exit with a failure return code and not allow you to remove the .NET Framework 1.1 because it is a part of that OS.
Similarly, you cannot use the cleanup tool to remove the .NET Framework 1.0 from Windows XP Media Center Edition or Windows XP Tablet PC Edition or remove the .NET Framework 2.0 or 3.0 from Windows Vista or Windows Server 2008. In addition, if you run the cleanup tool on an OS that has any edition of the .NET Framework installed as a part of the OS, it will prevent you from using the .NET Framework - All Versions option because there is at least one version that it cannot remove.
If you are planning to run the cleanup tool in silent mode, you need to make sure to detect what OS it is running on and not pass in a version of the .NET Framework with the /p switch that is a part of the OS or make sure that you know how to handle the failure exit code that you will get back from the cleanup tool in that type of scenario.
Unattended installation mode
The .NET Framework cleanup tool supports running in silent mode. In this mode, the tool will run and only show a progress dialog during removal, but will require no user interaction. Unattended mode requires the user to pass in a version of the .NET Framework to remove as a command line parameter. To run the cleanup tool in unattended mode, you need to download the cleanup tool, extract the file cleanup_tool.exe from the zip file, and then run it using syntax like the following:
cleanup_tool.exe /q:a /c:"cleanup.exe /p <name of product to remove> /u"
For example, if you would like to run the cleanup tool in unattended mode and remove the .NET Framework 1.1, you would use a command line like the following:
cleanup_tool.exe /q:a /c:"cleanup.exe /p .NET Framework 1.1 /u"
Exit codes
The cleanup tool can returns the following exit codes:
0 - cleanup completed successfully for the specified product
3010 - cleanup completed successfully for the specified product and a reboot is required to complete the cleanup process
1 - cleanup tool requires administrative privileges on the machine
2 - the required file cleanup.ini was not found in the same path as cleanup.exe
3 - a product name was passed in that cannot be removed because it is a part of the OS on the system that the cleanup tool is running on
4 - a product name was passed in that does not exist in cleanup.ini
100 - cleanup was able to start but failed during the cleanup process
1602 - cleanup was cancelled
Log files
The cleanup tool creates the following log files:
%temp%\cleanup_main.log - a log of all activity during each run of the cleanup tool; this is a superset of the logs listed below as well as some additional information
%temp%\cleanup_actions.log - a log of actions taken during removal of each product; it will list files that it finds and removes, product codes it tries to remove, registry entries it tries to remove, etc.
%temp%\cleanup_errors.log - a log of errors and warnings encountered during each run of the cleanup tool