Windows 7 x64 sharing problem - freeze

Hello to all, i`ve had strange problem... so the setup

PC1 Asus m51se - Win 7 x64
PC2 home pc - Win 7 X64

The problem is when a folder is shared under PC1 and PC2 try to download something from PC1, PC1 just freeze.
PC1 can download a file from PC2. Homegroup and simple sharing both have this problem.

Network setup: switch - two cables ( pc1, pc2 ) and both have a different real, static IP addresses.

Thank you,

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