malaizai,Your post has remained unanswered for quite a while. "plagerized solution--from Hexus" (i hope it works) --------------------------------------------------------------------------------
make sure the laptop is set to use DHCP to receive network addresses - i suspect it's hard-coded to the same address to the router, hence kicking it off the network
and "Following on from previous post, is your DHCP server set to allow enough address to be allocated? Has a similar problem recently where one device kept pushing another off the network, had to set allocationg to a higher number. "
truenorth