Firefox Malware Form File Error

Hi, Please help me in removing this malware worm from my exe file.
I was installing an add-on in Firefox while It gave back this error that the file is malformed means it is affected by a malware function and if I run this file on my computer my all data may be lost and maybe I will also lose my hard drive as it affects the clusters so the platters get destroyed by its actions.
Firefox could not install this item because “install.rdf” (provided by the item) is not well-formed or does not exist. Please contact the author about this problem.
So please the file named install.rdf is the only one copy that I have and I need to install it but first I need someone who can remove the malware function from the file.
I know it’s not a simple work or a task for any person who knows a bit of a computer.
It is the task for a programmer who will have to read the coding of this install file and remove the malwarecoding from there.
So hope to receive a message from programmer soon.
