Got the required driver from [URL]#Network  Thanks..
Host Name:                 PERSONAL-PCOS Name:                   Microsoft Windows 7 Ultimate OS Version:                6.1.7600 N/A Build 7600OS Manufacturer:           Microsoft CorporationOS Configuration:          Standalone WorkstationOS Build Type:             Multiprocessor FreeRegistered Owner:          Registered Organization:   Product ID:                Original Install Date:     06-11-2013, 19:37:15System Boot Time:          07-11-2013, 17:55:03System Manufacturer:       Dell Inc.System Model:              Inspiron N5010System Type:               X86-based PCProcessor(s):              1 Processor(s) Installed.                           [01]: x64 Family 6 Model 37 Stepping 5 GenuineIntel ~1170 MhzBIOS Version:              Dell Inc. A12, 25-01-2011Windows Directory:         C:\WindowsSystem Directory:          C:\Windows\system32Boot Device:               \Device\HarddiskVolume1System Locale:             4009Input Locale:              en-us;English (United States)Time Zone:                 (UTC+05:30) Chennai, Kolkata, Mumbai, New DelhiTotal Physical Memory:     3,063 MBAvailable Physical Memory: 2,108 MBVirtual Memory: Max Size:  6,124 MBVirtual Memory: Available: 5,089 MBVirtual Memory: In Use:    1,035 MBPage File Location(s):     C:\pagefile.sysDomain:                    Logon Server:              Hotfix(s):                 8 Hotfix(s) Installed.                           [01]: KB974476                           [02]: KB974560                           [03]: KB975599                           [04]: KB975617                           [05]: KB975741                           [06]: KB976781                           [07]: KB977178                           [08]: KB978258Network Card(s):           1 NIC(s) Installed.                           [01]: Realtek PCIe FE Family Controller                                 Connection Name: Local Area Connection                                 DHCP Enabled:    Yes                                 DHCP Server:     192.168.0.1                                 IP address(es)                                 [01]: 192.168.0.100                                 [02]: 
wifi does not work on my dell inspiron 15r windows 7. systeminfo given below