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i decided to install windows 8 on my PC without using DVD - i used a windows 7 usb/dvd download tool to extract windows developer preview on my usb, all works fine but after boot my USB screen is black at 30-60 seconds end computer reboots.

anyone have a answer for this problem (sorry for my english)

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You should let it run for as long as you can. It's a Dev preview and isn't optimized for speed.

Depending on your hardware, Windows does a number of task after you reboot from setup. I'd let it run.

For example, my laptop run for about 10 minutes and rebooted twice after the initial install.

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