Every web browser stores a cache of the websites you visit (e.g. HTML pages, images) to reduce bandwidth usage and server load.
This is called the browser's cache.
Clearing it occasionally can free up space on your computers hard drive if it's running low. Since every browser is different, the following sections will outline the steps involved in clearing the cache for the more popular web browsers.
Click 'Tools' (the Gear-shaped button on the top-right section of the browser), point to 'Safety' and click 'Delete Browsing History...' (Keyboard Shortcut: Ctrl + Shift + Del or Ctrl + t + d).
Choose the desired options you would like to delete (Temporary Internet Files, Cookies, etc) and click 'Delete'.
Internet Explorer 9 will now silently delete the items you've chose. Once finished, the notification bar (the bar at the bottom of the screen replacing the Information Bar in older IE browsers) appears stating that the selected browsing history has been deleted.
Note: IE8 has a "feature" which retains some cookies even after you clear your cache if you do not UNCHECK the "Preserve Favorites Website Data." If you truly need to clear your cache, you will want to uncheck this!
Once your browser is open, click the Tools menu. Or, optionally you may simply press Ctrl-Shift-Delete to open the Delete Browsing History window (and skip step 2)
Click on Delete Browsing History.
Select Temporary Internet Files.
Click the Delete button near the bottom of the window to delete your temporary files(i.e. clear your cache).
If you want the browser to automatically clear the cache whenever you close it, click the Advanced tab. Click to check the box next to the Empty Temporary Internet Files folder when browser is closed option (in the section labeled Security). Click OK. This will delete everything except cookies
Open IE 7 and click the Tools menu. Click the Delete Browsing History link at the top.
Under the Temporary Internet Files heading, click Delete files.
Click Yes when you see the prompt asking if you are sure you want to delete all temporary files.
Alternatively, clear your cache for just the current page you're visiting. Press and hold [Ctrl] on your keyboard, then Press [F5] or click on the Refresh button (square button on the toolbar with opposite-facing arrows).