Thanks for your response.
Here is what I got after typing lsmod command
linux-4x8f:~ # lsmod
Module Size Used by
ipv6 331544 18
binfmt_misc 30220 1
snd_pcm_oss 68992 0
snd_mixer_oss 35584 1 snd_pcm_oss
snd_seq_midi 27648 0
snd_emu10k1_synth 25984 0
snd_emux_synth 59392 1 snd_emu10k1_synth
snd_seq_virmidi 24960 1 snd_emux_synth
snd_seq_midi_event 25728 2 snd_seq_midi,snd_seq_virmidi
snd_seq_midi_emul 23808 1 snd_emux_synth
snd_seq 83600 5 snd_seq_midi,snd_emux_synth,snd_seq_virmidi,snd_seq_midi_event,snd_seq_midi_emul
microcode 32808 0
fuse 72256 7
loop 37508 0
dm_mod 88600 0
arc4 19072 2
ecb 20992 2
joydev 30848 0
crypto_blkcipher 38788 1 ecb
snd_emu10k1 180368 3 snd_emu10k1_synth
snd_rawmidi 46976 3 snd_seq_midi,snd_seq_virmidi,snd_emu10k1
snd_ac97_codec 143048 1 snd_emu10k1
ac97_bus 19072 1 snd_ac97_codec
snd_pcm 115208 3 snd_pcm_oss,snd_emu10k1,snd_ac97_codec
snd_seq_device 26516 6 snd_seq_midi,snd_emu10k1_synth,snd_emux_synth,snd_seq,snd_emu10k1,snd_rawmidi
snd_timer 45072 3 snd_seq,snd_emu10k1,snd_pcm
snd_page_alloc 28688 2 snd_emu10k1,snd_pcm
snd_util_mem 22912 2 snd_emux_synth,snd_emu10k1
rt73usb 45184 0
rt2x00usb 30848 1 rt73usb
snd_hwdep 28424 2 snd_emux_synth,snd_emu10k1
rt2x00lib 43136 2 rt73usb,rt2x00usb
snd 96248 20 snd_pcm_oss,snd_mixer_oss,snd_seq_midi,snd_emu10k1_synth,snd_emux_synth,snd_seq_virmidi,snd_seq_midi_emul,snd_seq,snd_emu10k1,snd_rawmidi,snd_ac97_codec,snd_pcm,snd_seq_device,snd_timer,snd_util_mem,snd_hwdep
firmware_class 27776 3 microcode,snd_emu10k1,rt2x00lib
rfkill 25888 1 rt2x00lib
ppdev 26504 0
usbhid 65488 0
i2c_i801 27804 0
input_polldev 22416 1 rt2x00lib
rtc_cmos 28728 0
crc_itu_t 18944 1 rt2x00lib
parport_pc 59592 0
hid 59296 1 usbhid
parport 60448 2 ppdev,parport_pc
i2c_core 45344 1 i2c_i801
ohci1394 50868 0
rtc_core 41012 1 rtc_cmos
iTCO_wdt 30800 0
mac80211 220436 2 rt2x00usb,rt2x00lib
emu10k1_gp 20992 0
rtc_lib 20224 1 rtc_core
floppy 83048 0
ieee1394 122216 1 ohci1394
serio_raw 24708 0
iTCO_vendor_support 21124 1 iTCO_wdt
sr_mod 35636 1
atl1 54924 0
intel_agp 48240 0
gameport 33936 2 emu10k1_gp
soundcore 26000 1 snd
ff_memless 23176 1 usbhid
button 27040 0
cdrom 53416 1 sr_mod
cfg80211 39568 1 mac80211
mii 23168 1 atl1
sg 56912 0
sd_mod 47280 7
ehci_hcd 56204 0
uhci_hcd 43936 0
usbcore 188248 6 rt73usb,rt2x00usb,usbhid,ehci_hcd,uhci_hcd
edd 28176 0
ext3 170768 1
mbcache 27396 1 ext3
jbd 82240 1 ext3
fan 23944 0
ata_piix 43268 5
pata_jmicron 23808 1
libata 194976 2 ata_piix,pata_jmicron
scsi_mod 194904 4 sr_mod,sg,sd_mod,libata
dock 29344 1 libata
thermal 43040 0
processor 72668 1 thermal
I also installed RT73 driver as instructed in the link. $iwconfig returned this reponse after installation
linux-4x8f:~ # iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wmaster0 no wireless extensions.
wlan0 IEEE 802.11g ESSID:“Sharma-Home”
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=27 dBm
Retry min limit:7 RTS thr:off Fragment thr=2352 B
Encryption key:off
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0