There are lots of topics and tips for IE7 standalone, but just write it down to memorize for my trifle work.

Download IE7 installer from Microsoft site, and IE7 standalone program from Tredo soft. Unstuff IE7 install exe by any archive app which can open rar file, and run xmllitesetup.exe. This setup program update system.
Put IE7S.exe into decompressed IE7 installer folder. Then you can run IE7 by using IE7S.exe.

# Limitation: it can not access SSL page.