How to fix problems with network controller sm bus controller pci simple communi

i bought i new toshiba L855 i5 and installed win7 ultimate on it. since then my network controller and PCI Simple communication controller are not working. they have a yellow exclamation sign on them. because of these i am unable to connect to the internet and my wireless is also nut working.
any help please
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More about problems network controller controller simple communi
  1. The yellow exclamation mark probably indicates the driver for the devices are not installed or were improperly installed. If you have a disk, install the drivers from there, or put the drivers into a flash drive to install from.
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