As far as I know, there is no way to look up history after it has been erased. That is, you can't do it through the browser. You can, however, use a small USB device called a key logger. This device will capture every keystroke entered on the keyboard, record all web activity, and compile a report and email you the report summary periodically. Use caution, though, as some of these devices are illegal to own or use in some jurisdictions. Check with a local Private Investigator to see if ownership/use of such devices is prohibited in your locale. If it is not restricted, the P.I. should be able to point you in the direction of where to buy one - if not sell you one himself.
