Firefox connection error,,,,,

hi

I am facing connection problem with firefox which is as follows,,,,,,

after every restart of firefox ,,,it automatically getting manual proxy settings,,,,
so that pages are not loading,,,,
pl check this image,,,,,,

*img170.imageshack.us/my.php?image=conn13yx.jpg

then everytime i have to adjust either at direct connected to internet or autodetect proxy,,,,,,,then its working nicely,,,,,,

*img170.imageshack.us/my.php?image=conn25cu.jpg

but everytime after restart of pc or after restart of firefox setting going to adjust automatically for manual proxy,,,,,

pls check images to understood my problem,,,,,,

regards
manoj