Thanks Everyone for your prompt replies.
I'm sorry about that.
Here's a more specific info:

--This happens to all the laptops in my work.
--We have one Dell 600m, one 700m, one Sony S270.
--They all have windows XP and Mcafee 2005.
--512mb of rams on all. Hard drives ranging from 40-80G.
--For the graphic cards, I'm not too sure I'll get back on that.
--For connection type, all of them use wireless G to connect to the internet through my NetGear 108Mbs wireless router model WGT624 with Firewall and security type is WAP.
--I use LIMEWIRE 4.8.1.
-- We have 4 dell desktops and they run Limewire 4.8.1 fine without problem.

So I think it's the issue with the wireless setttings on my router.

Please let me know if you guys need anymore info. THANKS .