My cousin comes to my house and always goes on my computer and looks in my history which can get annoying at times.Iv tried to delete it but she still finds it just wanna know how do u actually get rid of ur history itz nothing bad that i go on but some private things i dont like her seeing please help?
Re: History
If you are letting others use YOUR computer, then make sure you create a separate guest/standard user account for them; this ensures that limited settings are in place, and it will not allow any user on the aforementioned accounts to browse anything on your account (your files, cookies etc.).
If they are tech savvy, then i would also use the this free utility, CCleaner. It cleans all your temp folders, history, cache, cookies etc.
Hope that helps. 
Re: History
That would drive me up the wall if someone would start snooping around my computer. I wouldn't even give her a general guest access. I would create a separate account just for her and restrict it down so she can't open anything on the computer except the webbrowser.
but then again she'd start complaining so you can't tighten it too much either. :(