Try deleting your preference folder...
Fixes for Limewire when LW isn't operating as it should LimeWire Pref Folder in Vista
Your ISP also shapes p2p bandwidth...
† Free offpeak usage on all accounts.(00.00 to 08.00) Excess usage charged £0.75 GB pre-pay or £1 pay as you go.
Cap and Traffic Shaping in place.
Clearly defined depending on product type.
See TS Calculator