Hi bieds-mn and welcome to the RH community.
As far as your MS Office version is concerned you'd need to upgrade your RoboHelp licence when you upgrade to Office 2007. As for your Windows OS, Windows 7 is officially supported for RoboHelp 8. Your IE versions should prove no problem no matter what your configuration.
Thanks for the reply on the RH Community. Do you have any experience with automatic conversion process of moving files from one version to the next? Do you know can I go from 5 to 8 directly?
Please consider the environment before printing.
Converting a project is as simple as opening it in RH8. As soon as you do so, the application automatically upgrades the project for you. Just be aware that once you do so, there is no going back to the previous version. This is because the underlying code in RH8 is very different. Just make sure you make a copy of your projects before doing anything. You are unlikely to need them but it is better to be safe than sorry.