windows 7 on proxmox 3.1 problem

fresh installed proxmox 3.1
IP - xxx.xxx.210.47
Subnet - 255.255.255.192
GW - xxx.xxx.210.2

Windows 7 installed under proxmox
IP - xxx.xxx.210.44
Subnet - 255.255.255.192
GW xxx.xxx.210.2

1. proxmox can ping its gateway (no problem)
2. proxmox cannot ping win7
3. win7 cannot ping its GW
4. on other PCs, I can ping proxmox but not win7

please help me with this :(

Thank you