thanks a bunch marvik. finally my wifi is working.
heres the out put of iwconfig
as you said i tried lsmod | grep -i b43* and got some result which i am unable to get what exactly it is.
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
and this is the output i got after dmesg which exceeded the post limit. so i copied it in a text file and uploaded it. just a text file. look for the link.
b43 292690 0
mac80211 248838 1 b43
cfg80211 152934 2 b43,mac80211
ssb 37712 1 b43
now what next? please do guide me.