Server reboot for no reason

The following are events in my System log. System randomingly rebooting for no reason. Any and all help will be greatly appreciated.

Error code 1000008e, parameter1 c0000005, parameter2 8059e2dc, parameter3 f70d85b0, parameter4 00000000.

Error code 1000008e, parameter1 c0000005, parameter2 805bf557, parameter3 b7ce1960, parameter4 00000000.

Error code 1000008e, parameter1 c0000005, parameter2 8059e2dc, parameter3 f70d85b0, parameter4 00000000.

Error code 10000050, parameter1 e7155ddc, parameter2 00000000, parameter3 805bf557, parameter4 00000001.

Error code 1000008e, parameter1 c0000005, parameter2 805bf557, parameter3 b7b3d960, parameter4 00000000.

Error code 1000008e, parameter1 c0000005, parameter2 8059e2dc, parameter3 f70d85b0, parameter4 00000000.

Have you tried running a memory test. There is a great one avaliable here (http://www.memtest86.com/).