Yes, it really provides more protection from some type of malware.
There is malware that uses removable drives to propagate. Each time a USB stick is inserted into a machine infected by this type of malware, the malware will "infect" the USB stick: it will write itself + autorun commands to the stick.
The result of this is that when you stick that "infected" USB stick in another Windows machine, the malware will automatically infect the other machine via the autorun feature.
This fix prevents the autorun instructions from executing, and thereby prevents the infection of the machine into which you stick the "infected" USB stick.
But of course, if you are not careful and manually execute the malware on the "infected" USB stick (for example by double-clicking it out of curiosity), this fix will not prevent the malware from infecting the machine.
Edited by Didier Stevens, 18 April 2011 - 04:17 AM.
SANS ISC Senior Handler
Microsoft MVP 2011-2016 Consumer Security, Windows Insider MVP 2016-2019
If you send me messages, per Bleeping Computer's Forum policy, I will not engage in a conversation, but try to answer your question in the relevant forum post. If you don't want this, don't send me messages.
Stevens' law: "As an online security discussion grows longer, the probability of a reference to BadUSB approaches 1.0"