Ubunto installation problem

[compdoc]

>Machine: Selfbuild (running W7 at the moment)

>Processor: Intel i7-920 @ 4200mhz

>Memory: 3x2gb Corsair 1600mhz DDR3

 

 
That CPU running at 4.2GHz is over-clocking, isn't it? Have to you tried
installing with the CPU running at normal speed?
 
Have you tried running memtest86+?
 
 
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