Minidump 043008-01:
BugCheck 1000007E, {c0000005, bfaf2ad0, 92fe5c5c, 92fe5958}
Probably caused by : nv4_disp.dll ( nv4_disp+11dad0 )
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Minidump 043008-02:
BugCheck 1000007E, {c0000005, 8a2d0360, ae07ac50, ae07a94c}
Probably caused by : nv4_disp.dll ( nv4_disp+11dae5 )
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Minidump 050208-01:
BugCheck C, {0, 0, 0, 0}
Probably caused by : ntkrpamp.exe ( nt!KeWaitForMultipleObjects+37 )
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Minidump 050308-01:
BugCheck 1000008E, {c000001d, 891bd005, ae20ab94, 0}
Probably caused by : nv4_disp.dll ( nv4_disp+b83b8 )
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As you may or may not be aware, nv4_disp.dll belongs to your video card. Uninstall the current drivers in use and install the latest version available.