When you start your computer, you see a MS Removal Tool window that restricts you from accessing your desktop. You cannot start Task Manager, and you cannot open Internet Explorer or any other programs. This situation is the result of malware (a variant of Win32/Winwebsec) that is infecting your computer.
If you see a pop-up ad or an email for the “MS Removal Tool,” ignore it.
If you already have this malware on your computer, you might not be able to access Internet Explorer or any other programs.
As always, we highly recommend our users having their computers up to date and running a good antivirus application.
A good and free choice is Microsoft's own Microsoft Security Essentials.
If you can access Internet Explorer or another web browser, you can also use the Microsoft Safety Scanner to scan your computer and remove the MS Removal Tool.