Hi,
perkinshershel, and welcome to the forums.
Have you performed any sort of autotuning disabling on your machine, or else 'tweaked' the TCP/IP settings?
FWIW, Vista doesn't do well with tweaked TCP/IP settings like XP does - it has an autotuning feature that dynamically changes the values for various settings n the TCP/IP stack as needed, thereby making the need for tweaked TCP/IP settings a thing of the past.