Computer hangs on startup w/ black screen.Works on safe mode.[SOLVED]

formula1

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Jan 29, 2014
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hello everybody,
My computer hangs on start-up with black screen for a while .when i boot into safe mode it's working fine.
although when i boot into safe mode with networking it still hangs. so there something to do with the files/drivers that are loaded up with safe mode with networking.
maybe its an installed software not related to win7 (because it worked before) .but what kind of software is installed into the networking stage of the boot-up? how can i fix this?

thanks in advance.

update:
well, it was the mapped drives. it took windows time took to connect them on bootup.