Generally speaking, you do not need to do anything with cookies, temp files or browser history, all those are created and automatically maintained by your internet browser.
Maybe you should get a simple book on Windows 7, or teach yourself. For example, If you open Internet Explorer (the default browser for Win 7) you can click the 'tools' menu entry. (I'm not quite sure what version of IE you may be using, so menu options may differ) but in the list should be 'delete browsing history' which will simply remove the recent website addresses you have visited. Another menu option is Internet Options, which opens a panel and the first tab 'general' has a checkbox 'delete browsing history on exit' which does what it says it does - every time IE closes. Also try clicking the 'delete' button, which leads to another way to delete temp files, cookies and history any time you want to.
BUT, all those things are more useful to keep than you obviously understand right now. Just leave them to look after themselves.