I'm having problems with my Dell notebook's Wi-Fi, it can't see some of the available access points, despite they are close and I used to be connected to them yesterday. Other notebooks and my phone can see them. I believe it's a driver issue, since after installing system I haven't downloaded any network drivers. I went to Dell's website to search for them but I have no idea which should I choose. For my Dell Vostro 3560 and system Windows 8.1 64bit these are available:

Intel Smart Connect Technology Application
APP_iSCT_W8.1_A00_Setup-TJW84_ZPE.exe (23 MB)
Vostro-3560_Network_Application_TJW84_WN_4.2.40.2418_A00.EXE (29 MB)

Dell Wireless 1704 WLAN 802.11b/g/n (2.4GHz), Bluetooth v4.0+HS Driver
DW1704_W8.1_A00_Setup-K1HGN_ZPE.exe (239 MB)
Network_Driver_K1HGN_WN_6.30.223.143_A00.EXE (247 MB)

Dell Wireless1703 802.11 b/g/n, BT4.0 + HS Driver Dell Wireless1901 802.11a/b/g/n (2.4GHz and 5GHz), Bluetooth v4.0+HS Driver
DW1703_DW1901_Win8.1_A00_Setup-7FPWR_ZPE.exe (265 MB)
Network_Driver_7FPWR_WN_10.0.0.263_A00.EXE (272 MB)

Realtek RTL8105E/RTL8111E Ethernet Controller Driver
LOM_Realtek_W8.1_A00_Setup-0XCVW_ZPE.exe (6 MB)
Network_Driver_0XCVW_WN_8.018.0621.2013_A00.EXE (12 MB)

Intel® Centrino® Wireless-N 2230 Bluetooth Driver
BT_Intel_W8.14_A00_Setup-XR83W_ZPE.exe (31 MB)
Network_Application_XR83W_WN_3.1.1307.0362_A00.EXE (37 MB)