I recently tried to dual boot Elementary OS with Windows 7. I can see WiFi networks but when I try and connect to them, it asks for the password then tries to connect. After a while it stops and asks me the password again. I'm using a TP-LINK TL-WN881ND Wireless Adapter. Thanks for all your help in advance. Tell me if you need any other information.
Update: What terminal says after sudo lshw -C network
elementary@elementary:~$ sudo lshw -C network
*-network
description: Wireless interface
product: AR9287 Wireless Network Adapter (PCI-Express)
vendor: Qualcomm Atheros
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 01
serial: e8:94:f6:fb:2b:ff
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath9k driverversion=3.19.0-39-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
resources: irq:32 memory:fe800000-fe80ffff
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:04:00.0
logical name: eth0
version: 06
serial: 74:d4:35:99:77:fd
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
resources: irq:29 ioport:d000(size=256) memory:fe700000-fe700fff memory:d0000000-d0003fff
elementary@elementary:~$
iwlist scan | egrep -i 'ssid|cipher'and post what one you are trying to connect to – Jeremy31 Feb 20 '16 at 21:48