How can I make sure the browser (Microsoft Internet Explorer only) empties the browser-cache when I close it down? 

Note: This description is only valid for Microsoft Internet Explorer!

Start MSIE.
Open the Tools menu.
Click Internet Options...
Click the Advanced tab to the right.
Find a check-box named Empty Temporary Internet Files folder when browser is closed. Make sure it's checked.
Click OK, to close the options-box.
Close all instances of MSIE.
Restart MSIE to activate the changes.

If the above doesn't resolve your problem, call your Sysadmin!

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