Microsoft released Internet Explorer 11 developer preview, which will be available for Windows 7. Remember it is a prerelease version of IE 11, so it may have bugs, so install at your own risks.
Microsoft claims it have better performance and protection compared to the older versions.
System Requirements
PC with a 1 gigahertz (GHz) 32-bit (x86) or 64-bit (x64) processor
Windows 7 32/64 -bit with Service Pack 1 (SP1) or higher
Windows Server 2008 R2 64-bit with Service Pack 1 (SP1)
Super VGA (800 x 600) or higher-resolution monitor with 256 colors.
Read more and download the preview version from here