browser for 4700C ?

Hello

I finally managed to install Windows 7 on my old Dell Dimension 4700C.

I was alerted that the Explorer 8 browser was out of date and I was advised to upgrade to Explorer 10.

When I attempted to run the new Explorer 10 I was alerted that my machine could not handle the new browser.

Which version of Explorer should I use for the older Dell Dimension 4700C.

Thank you