Low transfer speed

I have 2 PC's connected through network cable (1Gb network cards). On one PC I have Win 7 x64 RC on another XP Pro. On PC where I have Win 7 I have 3 network drives from PC where I have XP Pro. When I try to copy some files from XP Pro PC transfer speed is very low (<1MB/s). Before, when I had Vista instead Win 7 transfer speed was about 50MB/s.

If someone knows solution to this problem, please help me.

Thank you.

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