It's probably one of the adds. I noticed you get different adds at different locations of the globe. So you have different adds then I have for instance.
Some of these adds contain malware, which has been the case last year. Maybe that's why you get the malware message. I won't get it because I don't have the same add on the site.
You could try to clean-up your browser's history, which is could be the cause of crashing and is always a good thing to do. Quite often I get a site running because I threw away the history.
Talking about the crash: what does actually crash? Your browser or do you have a total system lockup? Could it be that your malware detection program is broken so you get a freeze? Do you get any messages from the computer? Have you tried different browsers? You can easily get a portable app of Firefox and/or Chrome and use it without installing in your system. This alows you to determine if the problem is in IE or whatever browser you are using.
Recomendation for everyone:
1. Make sure you always have more then 1 browser available on you system, so install FF or Chrome alongside your Internet Explorer. You can always use IE as default if you like but if you have problems, switch over to the other. It won't harm your system at all.
2. Clean-up your browser's history (cookies etc.) on a regularely basis. Say once a month. It prevents a lot of problems!
3. If you're really concerned about malware, use a unix-like system like a Mac, Linux or BSD for your daily Internet browsing. They don't have issues with viruses, rootkits and spyware. You could even do it in a virtual machine system like vm-ware or vbox, so you could run de unix as a program within your windows and you don't have tor switch systems all the time and don't have to alter the system.