CCsvcHst.exe and Thunderbird update 5.1.6 problem

Never had a problem with these before, but I've narrowed the problem down to CCSvcHst.exe

When I attempt to patch Thunderbird 5.1.5 to 5.1.6  CCSccHst.exe goes into overdrive...takes 50% of memory, and prevents the Thunderbird patch from completing.  Even after the patch fails CCSvcHst.exe continues to keep 50% of the memory...the only way to get CCSvcHst.exe to stop is to do a complete shutdown of the pc. and then a restart.  No other program is causing CCSvcHst.ext to cause this problem.   I've tried disabling the firewall, and also E-mail scanning in NIS 2011, but still CCSvcHst.exe takes over.   So what's the problem here ?   All previous patches to Thunderbird have not caused this problem ?

 

WXP SP3

Thanks,

BY

 

..some added info....I updated Firefox with the recent patch, and CCLeaner fine, neither of these updates sent CCSvcHst.exe into overdrive