IE10 and Chrome crash spontaneously since 4/11 patch

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Today's patch appears to have slowed down my Win7 Professional 64-bit system; on top of that, IE10 and Chrome 27 now crash spontaneously even when idle, after an interval of 30-45 seconds after starting.  (On a side note, these forums don't appear to work

with Firefox, so I'm using Opera to post my problems.)

 

Other applications, which appear to use some HTML interfaces in dialogs and presentations are similarly affected.

 

I accepted an nVidia driver update from Windows Update and found out it was a rollback from the version I had installed (to 3.11 from 3.14); the Chrome crashes appeared to target an nVidia DLL, but since re-installing 3.14 the Chrome crashes remain although

they aren't localized by the reporting in the Event Viewer.

 

I saw that one of the patch items for this update had failed auto-installation and did the update manually--the issues started after that.  It seems related to package KB2808735, and I'm going to try to do a rollback, but I wanted to get this posted before

I tried that.

 

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