Computer completely locks up for 1-2 seconds

I've been trying to diagnose a problem that happens occasionally on my system. Occasionally when a taxing program is writing to the hard drive or my disk IO is being fully used, my machine will completely lock up for like 1 second (cursor wont even move). I cant really reproduce the issue EXCEPT if I use OCCT PSU test. That test will make my machine stutter in the same way that it locks up during normal use. But the freeze is even shorter during the PSU test. You guys have any ideas?

Intel I5 3570K
Asus Sabertooth Z77
MSI nvidia GTX 660
Corsair HW750 Professional
GSkill RipJaws 8GB 1600 9-9-9-24
Windows 7 Professional 64 bit
3 answers Last reply Best Answer
More about computer completely locks seconds
  1. what antivirus are you using?
  2. mauller07 said:
    what antivirus are you using?

    Free version of Avast
  3. Best answer
    get rid of it, avast tends to cause problems and system slowdowns, grab commodo or avg instead.

    run ccleaner file cleaner then registry cleaner when you remove it.

    should notice the difference onces its uninstalled.
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