In that case it's 50/50 because while I can't speak for v.9 Internet explorer tends not to stick to established web standards. The forum works a treat for me on win7 using Chrome, so give that a go. It could be they've not optimised the forum for what is a relatively new and unused browser like I.E. 9
For the webmaster it might be helpful if everyone struggling to read it can say what browser they are using, if indeed its an optimisation issue. In the meantime Chrome on win 7 is a goer. It imports I.E. settings and runs each window as a separate process and uses the website rendering engine, so it's an easy and stable alternative to migrate to.