Bold 9700 & BB messenger problem

Hi :)
Well since I'am new to the BlackBerry, I have some issues with my Bold 9700, I've updated the BlackBerry Messenger to version 5.0.0.57 using the Application Center, now every time when I try to load any apps using the BlackBerry Desktop Manager, it loads the old version of the Messenger to my device rendering the Messenger useless. Now if I remove the check on BB Messenger on the BB Desktop Manager it uninstalls it. Does anyone have a solution to my problem?

TIA,
RaVeN_1