Hi Melissa_Confuse,
I may be looking at your History images incorrectly, but it looks like the Disk Optimization, The Windows Temp Filles and the IE Temp Files were all succesfullyl completed in January (10/01/2014), and are shown as cancelled in March (17/03/2014).
This would indicate to me that N 360 did not accomplish any of the tasks in that time frame (from Jan to March) and were in fact cancelled in March.
Also have you looked under TASKS > Check Norton Tasks to see when those tasks wee last performed?
Just curious which browser you may be using, as there are settings that delete files upon exit from the browser?
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