Cannot detect wireless networks on Dell XPS L401

I have a Dell XPS L401 with Windows 8 PRO. My laptop is not able to detect any wireless networks even when my Wireless Switch is On. I'm not sure whether it is a hardware problem or software problem. This is the first time such a thing has happened. Plz help me

My System information is

Host Name:                 
OS Name:                   Microsoft Windows 8 Pro with Media Center
OS Version:                6.2.9200 N/A Build 9200
OS Manufacturer:           Microsoft Corporation
OS Configuration:          Standalone Workstation
OS Build Type:             Multiprocessor Free
Registered Owner:          
Registered Organization:   
Product ID:                
Original Install Date:     26-08-2012, 19:17:46
System Boot Time:          15-12-2012, 19:41:43
System Manufacturer:       Dell Inc.
System Model:              XPS L401X
System Type:               x64-based PC
Processor(s):              1 Processor(s) Installed.
                           [01]: Intel64 Family 6 Model 30 Stepping 5 GenuineIntel ~1730 Mhz
BIOS Version:              Dell Inc. A06, 22-12-2010
Windows Directory:         C:\Windows
System Directory:          C:\Windows\system32
Boot Device:               \Device\HarddiskVolume2
System Locale:             4009
Input Locale:              en-us;English (United States)
Time Zone:                 (UTC+05:30) Chennai, Kolkata, Mumbai, New Delhi
Total Physical Memory:     4,031 MB
Available Physical Memory: 2,991 MB
Virtual Memory: Max Size:  8,127 MB
Virtual Memory: Available: 6,970 MB
Virtual Memory: In Use:    1,157 MB
Page File Location(s):     C:\pagefile.sys
Domain:                    WORKGROUP
Logon Server:              \\MicrosoftAccount
Hotfix(s):                 33 Hotfix(s) Installed.
                           [01]: KB2712101_Microsoft-Windows-CameraCodec-Package
                           [02]: KB2727528
                           [03]: KB2729462
                           [04]: KB2737084
                           [05]: KB2751352
                           [06]: KB2753842
                           [07]: KB2756872
                           [08]: KB2758246
                           [09]: KB2761094
                           [10]: KB2761226
                           [11]: KB2761465
                           [12]: KB2764462
                           [13]: KB2764870
                           [14]: KB2768703
                           [15]: KB2769034
                           [16]: KB2769165
                           [17]: KB2769166
                           [18]: KB2770041
                           [19]: KB2770660
                           [20]: KB2770816
                           [21]: KB2770917
                           [22]: KB2771431
                           [23]: KB2771744
                           [24]: KB2771821
                           [25]: KB2777166
                           [26]: KB2777294
                           [27]: KB2778171
                           [28]: KB2779030
                           [29]: KB2779562
                           [30]: KB2780342
                           [31]: KB2780523
                           [32]: KB2780541
                           [33]: KB2785605
Network Card(s):           3 NIC(s) Installed.
                           [01]: Realtek PCIe GBE Family Controller
                                 Connection Name: Ethernet
                                 Status:          Media disconnected
                           [02]: Intel(R) Centrino(R) Advanced-N 6200 AGN
                                 Connection Name: Wi-Fi
                                 Status:          Media disconnected
                           [03]: Bluetooth Device (Personal Area Network)
                                 Connection Name: Bluetooth Network Connection
                                 Status:          Media disconnected
Hyper-V Requirements:      VM Monitor Mode Extensions: Yes
                           Virtualization Enabled In Firmware: Yes
                           Second Level Address Translation: Yes
                           Data Execution Prevention Available: Yes