i get this output for sudo lshw -C network :

 *-network               
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:08:00.0
       logical name: eth0
       version: 06
       serial: 3c:4a:92:cd:63:98
       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=N/A latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:42 ioport:3000(size=256) memory:c0404000-c0404fff memory:c0400000-c0403fff
  *-network DISABLED
       description: Wireless interface
       product: RT5390 [802.11 b/g/n 1T1R G-band PCI Express Single Chip]
       vendor: Ralink corp.
       physical id: 0
       bus info: pci@0000:0a:00.0
       logical name: wlan0
       version: 00
       serial: 90:00:4e:82:3c:5b
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
       configuration: broadcast=yes driver=rt2800pci driverversion=3.0.0-17-generic-pae firmware=0.34 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:17 memory:c2500000-c250ffff

i cant enable the wifi using the fn+f12 key.. its just stuck.

In windows 7 it gets enabled when i press the same keys. but this happens after it gets booted up...

i just want to use the wifi in anyway possible. can anybody help?