The first minidump is crashed at nVidia Display Card Driver and this version is unstable. You had better install an older version of nVidia Display Card Driver to avoid problem.
It fails with NT status code 8000003 and it is symptom of faulty ram. Run memtest to stress test the ram.
Mini010907-01.dmp BugCheck 1000008E, {80000003, b955064d, bacd3b38, 0}
Probably caused by : nv4_mini.sys ( nv4_mini+22c64d )