The “MS Removal Tool” or MSRemovalTool is malware. It is not a Microsoft product. This kind of malware is known as “rogue security software” because it imitates a real product. In this case, the Microsoft Malicious Software Removal Tool.
If you’re infected with this malware you might see a MS Removal Tool window when you start your computer and you might not be able to access your desktop. You might not be able to start Task Manager, and you might not be able to open Internet Explorer or any other programs.
The window might look like this:
The warning in your notification area might look like this:
Microsoft security software detects and removes this threat, but if you already have it you might need to boot your computer into Safe Mode in order to remove it.