Quality Centre 9 is not compatible with IE8, and Mercury is advising all their user to upgrade to latest version if you need to use it with windows 7 / IE 8. This tutorial will help you in opening Quality centre 9 on Windows7 without upgrading apying new license cost.
Here is how —
1. Run Internet Explorer as Administrator.
2. Open Quality centre URL and click below icon to run it is Compatibility Mode —
3. Then you will get following prompt to install Add on. Click On Prompt and install the add on.