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The .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:

While working on a client’s Gateway LT2030u netbook running Windows 7, I ran into an issue resolving dns names to IP addresses. The computer had been infected with a number of malware applications, including some Trojans and a large number of adware entries in the registry. But those were all cleaned up.

Despite several attempts to clear out everything, including:

• IPCONFIG release and renew
• removing NIC adapters and rebooting
• correcting the etc/hosts file

The computer still would not resolve a simple address like www.apple.com. IPCONFIG /ALL indicated that everything was configured correctly but Windows 7 still would not resolve the dns name.

Yes, a standard PING test to a physical IP address worked fine.

Most boot sector viruses detected by some of the best commercial antivirus software such as Symantec's Norton Antivirus, Microsoft's Security Essentials, or Kapersky's Antivirus can not be removed by these applications. And in many cases a boot sector virus is capable of alluding these applications unless the drive is connected to a clean system that has the AV software actively running.

What is a boot sector virus? This is a computer virus that infects a diskette or hard drive in the area which contains information about the configuration of the disk. The boot sector is used by many computer operating systems to determine how to access the diskette or drive. These viruses replace the critical boot sector program used to start the computer with their own malicious program often causing frequent computer crashes, allowing other malware infections, and performance issues.