I use wireless to my laptop and I dont have many problems but when I do, this is how I fix it.
If its lagging;
1. try to move closer to your wireless router, the signal is stronger the closer you are,
2. close as many other programs as you can.
If your problem is that you keep losing the connection,
1. try disabling your laptops wireless card and turning it back on (most laptops all you have to do is hit function(Fn) and F2 or another key, if you don't have a keyboard shortcut then you'll have to look around in your wireless/internet settings)
2. make sure that when your laptop is connecting to the wireless it isnt using the "connect one time only option."
thats all the help I've got for you other than switching internet companies/ wireless equipment, I've got verizon Fios and it works great.
ttyl,