I have a bunch of scripts written that run daily using Windows Task Scheduler. Yesterday i updated my version of ArcGIS from 10.1 to 10.3.1. Python was also updated to 2.7.8 as part of that installation. After the update, all my scheduled scripts get an error message of "1% is not a valid Win32 application. (0x800700C1)"
Under the settings tab i set "if the task is already running, then the following rule applies:" to "Stop the existing instance"
It is also set to run whether the user is logged on or not.
What am i missing?