LAN connection too slowly with XP

hi,
I have problem with the connection by 2 XP-PCs the LAN connection not correctly one charges to capacity and somewhere at 1-2%.
Then to the same network (over rout are connected all PCs) a buddy with Vista and with to copy from (larger) files to its computer attached itself was extent of utilization full with 95%-100%.How can be? Does an attitude is missing to be set with XP somewhat or have?

This makes the browse time quicker, You can also use the following to use 100% of the available bandwidth.
1. Type in gbpedit.msc from Run command
2. Navigate to Computer Configuration --> Admin Templates --> Network --> QoS Packet Scheduler
3. Change the entry of Limit Reservable Bandwidth to enabled, with a bandwidth limit of 0%.Reboot and it should make download/upload speeds a bit quicker.

If XP1 lasts => XP2 longer than XP1 => Vista can it actually only because of the XP2 be, or?There then ME can be only something at the network map, or a service etc. brakes out.XP has anyhow according to standard no inserted brake Suspicion beside the network map (on auto+sing posed?) stop is usually a Firewall, virus scanner or the like.

I meant not at all the SP, but meant the different XP computers (1 and 2).You say that copying a XP computer lasts on another long. (thus of XP1 on XP2)From a Vista PC on the XP (or differently rum one) ' s goes faster. (Thus XP1 on Vista)