Follow this link to information you’d rather not know about how vulnerable your computer may be. Warning: this article may require some computer expertise to understand (or maybe not).

The Matousec researchers found that common software tools, including Norton Internet Security 2010, McAfee Total Protection 2010, and Trend Micro Internet Security Pro all had flaws that allowed attackers to bypass the protections that these programs offer. The malicious software can do this without even having to run as an Administrator.
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The researchers found exploitable versions of this vulnerability in every program they tested, including products from McAfee, Trend Micro, and Kaspersky. In fact, the researchers said that the only reason that they found exploits in only 34 products was that they only had time to test 34 products (Microsoft, for its part, believes that its security software is not affected, but is still investigating the issue). Many others may be vulnerable too. They also developed a toolkit dubbed KHOBE (“kernel hook bypassing engine”) to allow the rapid detection and exploitation of such flaws.

As far as I can tell, if your computer does not have a multicore CPU, then it is unlikely that this flaw can be exploited.

Maybe I have good reason for not updating my machine.  And to think how often I have complained that I let the salesperson talk me out of buying a dual core machine the last time I upgraded.