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#11
Sounds like a good plan Ezhno, you don't sound so computer unsavey anymore.
Make the changes and do some testing, getting rid of those built in utilities is probably a good idea. Even at 1066Mhz you might need to make some adjustments to memory voltage or timings, possibly even CPU VCC may need some extra voltage it's hard to say from here.
I wouldn't consider it solved until you can go a few weeks with zero problems so time will tell.
If you use the Windows version of memtest it's important that you follow the instuctions in the link below "I wrote them". How to use Memtest for Windows
You just run the same number of tests as you have CPU cores or threads, 8 in your case I believe, then you divide the Unused memory into each test and run them all at once.