I have been looking at I.E.7.pro.
It won't mess your IE installation, its default setting will help (somehow), it's not a panaceia for sure.
You should think on using Firefox...
Would there be conflicts etc.And would it take up a lot more ram having both. .
Neither IE and Firefox are incompatible, neither Google and Yahoo toolbars.
But I suggest Firefox and Google toolbar if you need to choose between then. Just my opinions...