It is not crashing in safe mode. So we may easily consider that it is not the hardware related issue.
Can´t it be a GPU problem that only shows itself when the driver
is installed and the computer start using its features?
I´ll install Driver Fusion and try removing the network driver. The generic driver was not installed after the fresh install, so the network will be marked as unknown device.
I think it will keep restarting because the first time I´ve installed just the catalyst without any other driver.