You need to install the Dell notebook system software (under utilities) and the chipset driver (under chipset).  There is a separate USB driver required for USB 3.0 support.

Try R292473.

Refer to my A Clean Install of Windows and ensure you have got all the other needed drivers for maximum performance.

Thanks for this information, but when I installed chipset driver only SM Bus Controller is okay. But  PCI Simple Communications Controller and USB controller still need drivers. and I can't use 3.0 USB. I'm with dell insipron n5110 with core i7.

See above.  You need to install the Dell notebook system software and the USB 3.0 driver.

Where can i find this software?  I think I need CONEXANT_D400-USB-MODEM_RY5VP_A02_SETUP_ZPE.exe  this driver but when I click to download it from dell site says "File not found"

Thank you so much :) I installed this programes and now I use my 3.0 USB :) but PCI controller says again no driver :D:D:D and I've question. Is there driver fot the Web camera? I'm sorry for this questions but this is my first laptop :)