Hi Amalia,
All of your minidumps are crashed with same symptom. The culprit is Norton AV as your vesion of Norton causes blue screen. Upgrade or de-install Norton AV resolves the blue screen
Debug report
Mini120205-01.dmp BugCheck 1000008E, {c0000005, 8059dcac, f59285b0, 0}
Probably caused by : SYMEVENT.SYS ( SYMEVENT+5e06 )