Unlike most other programs on your computer,, you won't find IE9 listed on the Uninstall or change a program screen. That's because Internet Explorer 9 installs as a Windows update. Here's what you need to do to uninstall IE9 on Windows Vista or Windows 7:

click your windows button and type view updates in the search box.
Once the results appear, click view installed updates.
If you don't want to search, press Windows key +R and paste in the following:

C:\Windows\explorer.exe shell:::{d450a8a1-9568-45c7-9c0e-b4f9fb4537bd}

then press Enter. wait for the Uninstall an update screen to load completely scroll through the list until you find Windows Internet Explorer 9.
Hit your applications key and hit enter on Uninstall and confirm that you want to uninstall.