[Q] Music player app problem on Note n7000

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http://forum.xda-developers.com – hi...I just manually updated my galaxy note to JB ( INU DDLSC rom downloaded from sammobile.com ) ....I cant find the stock music player app...so I checked for it in the application manager n found the app with app details with all data, cache etc with 0 bytes...so I downloaded the stock apk n when I try to install it asks ' it is a sys app.do u want to replace it' if I select yes also the app installation is not possible...can anyone suggest a solution for this ....I need stock music player..( the phone is rooted). (HowTos)