ok cool, this isnt a fix in itself, but it will at least sort out any broken files on the laptop so class it as major step one!
next get those drivers checked. You may need to upgrade your wireless card drivers, and theres a few ways of doing this, my first port of call would be the laptop manufacturers website, go there, go to support and drivers, find your laptop model, then find the drivers for the wireless, download to laptop, then install. when you install, it will cut you off the net for a minute then should re connect.
next step is to check IE, if you are using IE? if so, download firefox, and use that, see if you get the same issues. if not, find out what version of IE you have (click help / about internet explorer) and if its not 8, you need to upgrade.