Download Speed Keeps Slowing Down

When I connect I get a fair download speed but EVERY time it slows down to nothing. I try different files and it is always the same. I have a DSL line connected to a Cisco 658 modem and a wierless router. I'm running K-Lite K++ Ver. 2.4.3
I would appreciate any help.

Get KaNAT by clicking the word "P2P" in my sig. Then, follow MUSCLEMAN's and FTFakes' guide to port forwarding.

unless you have updated your 2.4.3 then either update it or try klr2.5.0 or k-lite2.6

Find them both here.