Hi Sambino,
I'd start by going into the jobs concerned, and into the section dealing with start time/start dates etc, and reset the effective date.
As follows:
Job Setup --> "job concerned" --> Schedule --> Edit Schedule Details --> Effective Date.
You can then make sure that the date the schedule goes into effect on is the date you want it too (today, tomorrow, Monday etc). This should automatically reset the schedule.
Let me know if you come right or not!
Laters!