Windows 7: Not sure of my internet explorer configuration/settings

I'm a newbie to Windows 7 Home Premium & think maybe I've messed up IE9. It seemed to me to be slow & some sites left me with hundreds of items in Temp.IE Files while others, this one in particular, just left 1, so in trying to get less from somewhere else I messed around with IE settings & now don't even remember what I did. So actually I guess my main question is: what is Microsoft Fixit? I've seen reference to it several times but have never used it. I have a very wide 'yellow streak' down my back & don't know which way to go.

Thank you.
oops, forgot to mention that the reason I came here to post was that I'd been in the Tutorials doing some reading when I was interrupted by a phone call & when I came back to continue, it took what seems like forever to 'wake up' my screen. Then when I came back here to edit, it again took too long to open my post. I'm sorry, my wording may be wrong, hope this makes sense.

Regarding IE9 setting changes:

IE has a lot of "Restore Default" options in the settings.
Try going back through the IE Options and setting everything back to "default".

Internet Explorer - Reset

If your OS came with IE8, you should also be able to uninstall/re-install IE9...

Internet Explorer 9 - Uninstall