Wireless DNS problem

Hi frends,

I have Windows Vista on a Dell Inspiron e1705 with Dell 1390 wireless minicard on the system. I'm having problems in the internet connection. I can connect to the internet but after a certain time ( 45 min.s or so ) I can't open pages on Interent explorer 7 or any Firefox or whatever browser I use. It says that the page can't be displayed but still I can see on the system tray that it shows there is interet connection ( no "limited connectivity" ),,, If I dont sign out of windows live messenger before that problem occur, then I'm still able to use the windows live messenger and still have conversations. And one thing, my downloads are still in process,,, the files are still getting downloaded. But I can't surf any page. it says, There is a DNS error ,, after a certain time interval,,, like 15 - 20 minutes ,, the connection goes fine again,,,and then again comes the problem,, it goes around and around ,,, do you guyz have any idea about this?.. please help me out guyz...

thank you so much.

 

thanx for the quick reply,,,
Yes, I surf the internet while the files are downloading,,, but when i use my frend's laptop, there never shows up such dns problem even if i'm downloading in background,,

 

Yes, on my broadband connection, that frend's laptop works fine,,,

 

If you download HJT from here, you'll get the latest version and it'll automatically install into it's own folder. HijackThis 2.00.2 direct download.

 

That's the current owner of the HJT program, so it should be current. I've never had any issues downloading from there, and since it's a major AV company, I suspect they' don't get knocked off the air too often.