[thopok]

Stop 0x7A is usually caused by a bad block (sector) in a paging file, a virus, a disk controller error, or failing RAM. In rare cases, it is caused when nonpaged pool resources run out. It is also caused by defective hardware.

Conclusion
Crash dumps are enabled and no crash dumps have been found on your computer. In case your computer does experience sudden reboots it is likely these are caused by malfunctioning hardware or power failure. Then it's suggested you contact the support department of the manufacturer of your system or test your system with a memory test utility for further investigation.