Basically , Microsoft's IE browsers have a security hole, but if you got the windows update on last Friday, you should be fine.
If not do a manual windows update just to be sure.



Internet Explorer Fix it available now; Security Update scheduled for Friday
MSRCTeam
19 Sep 2012 3:20 PM

[Then, on this Friday, Sept. 21, we will release a cumulative update for Internet Explorer through Windows Update and our other standard distribution channels. We recommend that you install this update as soon as it is available. If you have automatic updates enabled on our PC, you won’t need to take any action – it will automatically be updated on your machine. This will not only reinforce the issue that the Fix It addressed, but cover other issues as well.]
http://blogs.technet.com/b/msrc/arch...or-friday.aspx