We have received several emails today from people who are having problems with the patch.  One that is confirmed by Microsoft is the Realtek problem.  Microsoft has been working on this problem and have provided a patch for the problem at:

support.microsoft.com/kb/935448/


Other possible issues have been reported and are being investigated.  Microsoft is asking anyone having problems after installing the patch to contact them at Microsoft Product Support Services at 1-866-PCSAFETY.  There is no charge for the support relating to Microsoft Security Updates.

support.microsoft.com/