For those of you that have the Adobe Reader for PDF files on your computer, and that is virtually everone, you need to download a new version of the program.  There is a flaw in the computer that allows malicious code to be executed.  A virus is ciculating that takes advantage of the problem.  If the infected PDF file is opened, it lowers security settings on Windows- based machines and installs other malware.  The update is here:

     http://www.adobe.com/products/acrobat/readstep2.html

Also, if you use the Firefox browser, there is a new version out (2.0.0.8) that fixes 10 problems with Firefox:

    http://www.mozilla.com/en-US/firefox/

Next week there will be another new version (2.0.0.9) because these 10 fixes brought to light 4 or 5 other problems, so check again next week for another update.]