You do not need to uninstall IE10, IE10 still has an 32-bit version within your pc it is usually located at.
C:\Program Files (x86)\Internet Explorer
Get a program like process explorer to check the program is running in 32 bit.
Edit: I know that the poster needs an older IE, however if the issue can be solved with 32 bit IE with comparability mode I don't see the need to downgrade IE. This is how I run it in compatability mode.
Open up Internet Explorer 10.
Press ‘Alt’ key on your keyboard to bring up the top menu. And then go to Tools > Developer Tools. Alternatively you can just press the ‘F12’ key on your keyboard.
Go to Tools > Developer Tools
- This will bring up the IE developer tools which looks just like the one in Google Chrome at the bottom.
You can then click ‘Browser Mode’ and then click on the Internet Explorer version you want to simulate. You can also set the document mode to quirks mode or standards mod from the next drop down .