Win 7 64 bit is hand at starting windows "configuration 15%"

I have new computer with new Win7.
Only after hard-restart and safe mode it was fixed.
It happened twice.
what should I do about?

I realize it hang after screen saver is in active.
which mean, while I am working, everything is ok but when I leave it for a while and touch the mouse and the computer try to back from screen saver it is then hang.

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