Enabling task manager?

Hello,

My task manager used to work but then suddenly stop working and it keeps saying its disabled. So i am trying to enable it. Anyway i have tried doing the tutorial on this site but after going into the the logon folder there is no option to enable the task manager. I have no clue what to do thats why i turned to you. I would appreciate any help. I need task manager because recently pop ups been bothering me badly, they pop up every 5 min and no pop up blockers work. Anyway thx for your help