You are in the middle of something and you lose your internet connection. What a pain!
You don't feel like calling the ISP and getting up to check your cable connections or resetting your cable modem. If your computer connects through a DHCP server, which chances are it does if you have a router, it means your IP address is automatically assigned by the server and can sometimes need to be renewed.
You can do this by restarting your computer or if you want to save time there is an easier method. Try this:
Go to START/RUN. Type CMD.
Type ipconfig /release
Type ipconfig /renew
Voila! Your internet connection is renewed.