dump 1:
BugCheck 1000000A, {fefefefe, 2, 0, 804dbc95}
Probably caused by : ntoskrnl.exe ( nt!KiUnlinkThread+7 )
DEFAULT_BUCKET_ID: DRIVER_FAULT
BUGCHECK_STR: 0xA
PROCESS_NAME: WinAVI.exe
IMAGE_NAME: ntoskrnl.exe
DEBUG_FLR_IMAGE_TIMESTAMP: 45e54711
FAILURE_BUCKET_ID: 0xA_nt!KiUnlinkThread+7
BUCKET_ID: 0xA_nt!KiUnlinkThread+7
dump 2:
BugCheck 1000000A, {2070019, 2, 1, 80505e6b}
Probably caused by : amon.sys ( amon+46b6 )
DEFAULT_BUCKET_ID: DRIVER_FAULT
PROCESS_NAME: WinRAR.exe
IMAGE_NAME: amon.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 46440bc2
FAILURE_BUCKET_ID: 0xA_W_amon+46b6
BUCKET_ID: 0xA_W_amon+46b6
dump 3:
BugCheck 1000008E, {c0000005, 1, f6974ca4, 0}
Probably caused by : Unknown_Image ( ANALYSIS_INCONCLUSIVE )
KERNEL_MODE_EXCEPTION_NOT_HANDLED_M (1000008e)
This is a very common bugcheck. Usually the exception address pinpoints
the driver/function that caused the problem.
DEFAULT_BUCKET_ID: DRIVER_FAULT
BUGCHECK_STR: 0x8E
PROCESS_NAME: WinAVI.exe
dump 4:
BugCheck 1000000A, {9000d, 2, 1, 804dc353}
Probably caused by : ntoskrnl.exe ( nt!KiTimerExpiration+86 )
DEFAULT_BUCKET_ID: COMMON_SYSTEM_FAULT
BUGCHECK_STR: 0xA
PROCESS_NAME: WinAVI.exe
IMAGE_NAME: ntoskrnl.exe
DEBUG_FLR_IMAGE_TIMESTAMP: 45e54711
FAILURE_BUCKET_ID: 0xA_W_nt!KiTimerExpiration+86
BUCKET_ID: 0xA_W_nt!KiTimerExpiration+86
I think there is a problem with drivers, probably chipset and/or video card.
you should also check the memory one bar by a time and all together. plus check the hdd for bad sectors.
this would be the first things to go after. please post back your results.