Hello foreverstill and welcome to BC,
Due to respect for peoples privacy, I am unable to help you with recovering browsing history, I hope you understand.
If you are worried about somebody accessing unsuitable sites, why not set up a separate standard/limited account for them and use some parental control software.
Or maybe check out something like OpenDNS
.OpenDNS content filter options example image.
Edited by RedDawn, 19 May 2009 - 08:16 PM.