one bugcheck shows an access violation
the other shows a corrupt page table entry
would need to look at the actual dump file to get a better idea.
for the access violation, you would turn off any overclocking. if you are not overclocking or the system is not overheating. you would update the bios, or reset it to default then run memtest86 on its own boot image to confirm your default memory timings
for the second one you would update the cpu chipset drivers. turn of the system virtual memory reboot and turn it back on to get a new pagefile.sys
this error could also be due to memory issues. ie something copied to a place in memory then paged to disk. if you have memory problems the data gets corrupted. stupid programming error would also generate this bugcheck. (deleting a memory object twice)
more common with virus scanners getting messed up by old network drivers. (update the network driver)