Lyne, I replied there, but I'll say this here, too...don't open a new window, open a new tab in the existing window.  Opening a whole new instance of the browser uses a lot more resources than opening a new tab.  If you stick with IE8, you might have to set tabbed browsing on.  It's in the Tools/Internet Options dialogs.  You can have several "home" pages as separate tabs in your setup, too.  When you start up the browser, it opens all those pages automatically.  If you don't have much memory, don't put more than two or three as home pages.

Dana