First of all, just because somethings temporary, doesnt mean you cant delete it.
It could be temporary from startup to end of session, then next startup be there again.
try deleting it first, and see what happens.
Post here and let me know how it goes.
Also, how comes Norton isnt deleting it, if its blocking it?
Btw, if its infected a system file, you can probably find a dupe of that specific file on the internet, then you can delete the infected one, and replace with the Working duplicate.