Which bit? For the traceroute...
search for cmd > open it > "tracert www.bbc.co.uk" or replace the www.bbc.co.uk with a known counterstrike server.
Your routers ip will be the first hop.. and will likely look like 192.168.0.X or something like this. You want this one.. and . the one after (which will be in your local telaphone exchange). and the last one, which is the remote server.
You then need to open 3 cmd windows at the same time.. and in each set a continual ping to each of those 3 addresses.. the command is "ping -t 192.168.0.1" for example.. you will see the pings continually going.. when you have a drop out look at these windows.
If the one going to your routers address (192.168.x.x.) is dropping this means it is a problem with your wireless or similar. if this one is ok but the other 2 are sropping it is a problem with your internet connection to your ISP.
As for the wireless channel.. if you find it is the wireless it can be tricky.. especially when you are using a repeater..
You would need to access the web management page for your repeater and see what settings are available.
It should have some channel numbers selectable... if these are numbered from 1 to 12.... try changing between 1, 6. and 12 to see if this makes things better or worse. if they are nubmered in the 40s, try changing to another random channel far away from your current one.
You can download programs which help you egamine wireless and which channels etc to use.. I used to reccomend inssider but i dont think its free anymore.