Vista connected to the wireless network, can't even ping router

Hi guys.

I've been struggling with this for a while, and I've run out of ideas (and internets...)

The problem is: my Vista machine (Compaq Pressario CQ60 with Atheros Wireless card) connects to the network, gets (valid) IP address by DHCP, but can't even ping router. All other machines (Linux machine and Android phone) work just fine.

Things I've already tried:

• Installing all Windows Upgrades
• Disabling Windows Firewall
• Disabling Avast Firewalls
• Disabling User Access Control
• Setting static IP (above .100)
• Disabling IPv6 communication
• Changing WPA security settings
• Clearing the ARP/DNS tables

So... I've run out of ideas. Full system virus scann is going on right now. Have anyone had similiar problem? Can you tell me what else can I try?
Unfortunatelly I have no physical access to the router and it's settings, so I can't change anything on this side.

Any help or idea will be appriciated

Can you follow this tutorial so that I can see your IP configuration which may help me in determining the cause of your problem - http://www.vistax64.com/network-sharing/284688-network-posting-tips.html

Also, when you complete a ping request do you ping the IP address or the hostname? If the hostname then please try to ping the IP address as this may be an issue with your DNS servers.

Lastly, what is your router make/model as some routers disable ICMP echoes (ping) therefore it may be a setting on the router that needs changing.

Many thanks,
Josh!