Vista Slow Issues

Microsoft has a update that may fix this issue. Or check these posts. Vista: Slow Network PerformanceHome Vista: Slow Network ...
www.chicagotech.net/vista/vistaslow.htm

Improve Vista speed by turning off Auto-Negotiation
Vista: Calculating Time Remaining
Vista hangs when connecting to a network
Vista: The copy process may stop responding (hang)
Vista runs slow
Vista runs slow in SBS network
Vista slow speed issue
Vista Slow Issues Solution 
Vista slow performance in network