Do you mean

Internet Explorer?

If so, what about the rest of the OS? The browser will only take up what language the OS is set as.

That said, it looks like I am wrong.

See if you can uninstall the Spanish version of IE, guidance here;
http://windows.microsoft.com/en-US/windows7/how-do-i-install-or-uninstall-internet-explorer-9

Then install the English version of IE, guidance here;
http://windows.microsoft.com/en-US/internet-explorer/downloads/ie-9/worldwide-languages

One caveat: Do you have another browser you can use to re-visit the MS web site and download the proper version?

Mark