I seem to recall some memory issues with this series of mobo's - but haven't seen any issues recently. Dunno if that's significant, but I mention it for the sake of completeness.
Absolutely 0 errors in Windows Error Reporting in the MSINFO32 file - very unusual. Have you done anything to turn this off? What do you do with jv16 PowerTools? What about CCleaner? What version of Acronis are you using?
Please remove Gigabyte ET6 - it has some issues with Windows 7.
This entry in the System Event Log suggests that you've cleaned things out:
Log Name: System
Event ID: 104
Task: Log clear
User Name: UD3PQ9550\Ken
The System log file was cleared.
Please don't use any of the tweaking/cleaning utilities until we're finished troubleshooting.
For now, just run the system until you get the errors (a couple of times would be best).
Then repost the information and we'll have another look at it.