@rafaxs 

I would look at the network settings of the computer. Does it sound like the computer may have a static IP address assigned to it? If so, give in an IP that is a number away from your DHCP pool.

For example, if your router gives out IP addresses from 192.168.0.100 - 192.168.0.199, make sure your computer has an IP of 192.168.0.250.

If your computer's network adapter is running where it automatically gets an IP (DHCP). Try renewing the IP address by opening the command prompt, and typing: ipconfig /release and hit the enter key, now enter: ipconfig /renew and hit the enter key. That is similar to rebooting your computer where it will ask to get a new IP address.

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