Sorry for this issue, it is our hosting provider that has been compromised. We will continue to monitor the situation and try to keep the site from getting these error messages until it is fixed. The problem does not pose any risk to our members, it just affects the major search engines.
Though I am using I.E. 8 and have no such error....
I had the same message on IE 9 for a couple of days; same on Chrome.
I admire the people who ignored the warning( except for the way with thin client as VaHam described)