Hi,
Probably the culprit is faulty ram. Your version of Norton AV is one year behind. You had better upgrade Norton AV to latest patch and run memtest to stress test the ram.
Mini012806-01.dmp BugCheck A, {50, 1b, 1, e0830e72}
Owning Process fe076a90 Image: sddsrv.exe
Probably caused by : ntkrpamp.exe ( nt!KiUnwaitThread+8 )
Mini022506-01.dmp BugCheck 24, {19033c, ee7b386c, ee7b3568, efe25b12}
Owning Process fcf6bb60 Image: sybmbuf.exe
Probably caused by : Ntfs.sys ( Ntfs!NtfsCompleteRequest+43 )
Mini032606-01.dmp BugCheck 1000008E, {c0000005, e082918f, ed0ccbe0, 0}
Probably caused by : ntkrpamp.exe ( nt!KeWaitForSingleObject+25b )
Mini033006-01.dmp BugCheck A, {50, 1b, 1, e0830e72}
Owning Process fdf445e0 Image: sddsrv.exe
Probably caused by : ntkrpamp.exe ( nt!KiUnwaitThread+8 )