Help! Cannot continue singler player saved campagin folder beacme 0

Hi,

I have not played SC2 since Nov from last year. (I always been playing as guest against computer). Last night, I logged back in as guest after ran through all the updates. However, I was not able to continue my campaign since my last save from Nov last year. I can only start a new campaign which I do not want becasue i already completed half of the missions. I quit and browse the folder and found that now i have 2 folders under account folder. The new campaign folder being created last night named "567893" and my last save in Nov from last year named to "0" and I saw bunch of the missions Ih ave completed under "0". Can anyone tell mehow do i play my last saved campaign "0" again. That way, I do not have to start over and continue the rest of the missions.

Thanks.