Since the WMF vulnerability remains unpatched, I'm now using Firefox instead of Internet Explorer a lot more than before (Firefox is an Web Browser similar to Internet Explorer). Why?

Via F-Secure:

In our tests (under XP SP2) older versions of Firefox (1.0.4) defaulted to open WMF files with "Windows Picture and Fax Viewer", which is vulnerable. Newer versions (1.5) defaulted to open them with Windows Media Player, which is not vulnerable...but then again, Windows Media Player is not able to show WMF files at all so this might be a bug in Firefox. Opera 8.51 defaults to open WMF files with "Windows Picture and Fax Viewer" too. However, all versions of Firefox and Opera prompt the user first.

http://www.f-secure.com/weblog/archives/archive-122005.html

This is the level of protection that is necessary at the moment. If you don't have Firefox, then I suggest you download it now.