Error message when on certain websites! Help!

I have my own website and lately when I access it via IE, I get an error message that says: IE explore has encountered a problem and must close down, sorry for the inconvenience. This is also happening to several of my members ion the forum. This is some of the info the report gives me:
APP name- IE explorer
Mod Ver- 6.0.2900.2523
App ver-6.0.2900.2180
Mod name- mshtml.dll
offset- .00215357

Any advice on how to stop this from happening? I have tried to research this problem myself and have come up with nothing. Does this mean that someone is hacking into my computer?

Thanks

 

do you have the latest patches for your operating system installed?

 

Yes I do believe so. I did download the SP2 from microsoft. Do you know anything about the Bugdoctor PC cleaner or any of the other PC cleaners?