And why don't you just use
Internet Explorer 7 which supports tabbed browsing? Just run windows update and there you can install it.
But you can also use
Opera 9.5 which also supports tabbed browsing or
Firefox 3 which also supports tabbed browsing.
But what do you mean with support for "Notepad". Do you mean that you search for a browser which supports the Tablet Input Panel, so that you can enter text in slate mode without problems?
If you mean this, then you can use any of the above mentioned browsers. IE and Opera support it natively, for Firefox you'll need the
Gesso extension
So you can take the browser you prefer. Both Firefox and Opera are better than IE, Opera is a bit faster and lighter than Firefox, Firefox has a larger community and more Add-Ons or extensions, but you'll need to install some of these extensions to get some features Opera has already implemented.