I like the sound of temporarily changing the video card - if you have a spare - it sounds from your description as if the reboot is triggered by the video mode change. During the early part of the boot sequence a special driver is used then when it goes into safe mode it initially starts at VGA 640x480 then later swaps to the SVGA driver.
Re-installing your video card drivers may also change the result (if they have corrupted) I am struggling to think of something that loads in SAFE MODE after the desktop and menu appears, anyone think of something. It is the point in the boot sequence when LKG is written but I think that happens directly you log on and a disk fault in the LKG files would be picked up by chkdsk anyhow.
Lot of fizz on the web about this problem being caused by InCD (the packet writing software that comes as part of Nero Burning Rom) if you got it try removing it.




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