Your crashes are more consistent. You haven't replace the faulty Nvidia Display card 66.93. Install 61.77 or latest nVidia Display Card driver.
Mini080705-02.dmp 8E (c0000005, 80565a56, f3ea096c, 00000000) nt!KiFastCallEntry+f8 -> nt!NtWaitForMultipleObjects+2dc
Mini080705-03.dmp 8E (c0000005, bfb64981, f0d749c0, 00000000) nv4_disp+191981 Time Stamp:4182eb4e
Mini080705-04.dmp 8E (c0000005, 804d9079, f2544950, 00000000) nt!NtWaitForMultipleObjects+2ec -> nt!ObfDereferenceObject+2c
Mini080705-05.dmp 8E (c0000005, 00ffffff, f76d945c, 00000000) nt!KiCallUserMode+4