This issue was resolved in SilkPerformer 2011 with hotfix SP83_HF15_TcpIp. 

The issue was resolved in SilkPerformer 2010 R2 with SP82_Hotfix12_TCPIP.

Please contact SupportLine to obtain these hotfixes.

It is also possible to disable the Windows Update using the links available on the Microsoft article at http://support.microsoft.com/kb/2643584.