|You have to read the routers manual and look for QoS (quality of service).|
If the router supports such settings for the QoS, you can change the priority for services.
So if you don't use skype, the others can use the full speed, but if you're using skype, they may get e.g. only 50 percent of the bandwidth.
The original poster should always write the last response !!!
Let us know, if the problem is solved !!!