If your using Windows......go to start....then Find....Files or Folders...type in cache then press OK. You may have several cache folders pop up. Open each one and look for the one that has about a gazillion bunch of stuff. Go to your tool window and press edit....select all....right click on all the blue ones and hit delete. The only one it shoudn't delete is the file Fatdb. It's usually the first one on the list. This will clear your cache.
The browser is the thing you access the internet through. Either Internet Explorer or Netscape...probably....unless you have a Dell.