My Mac 10.7.5 won't shut down after new software (security update 2013-003) installation-- hangs at grey screen with "software update" at top.  It also intermittently goes to sleep without my asking.  What to do?

My Mac 10.7.5 won't shut down after a new software installation (Security Update 2013-003).  It just hangs at a grey screen with "Software Update" at the top.  I have to force quit, then restart-- but the new software hasn't installed.
My Mac also intermittently goes into Sleep mode, repeatedly, unprompted by me.  I suspect a connection between these two problems.
I have tried deleting the /Library/Updates folder.  It hasn't helped.  The update still won't install, and my Mac won't shut down without my forcing the quit.
Help please!

Hi, I've just come accross the same problem... did you manage to get a resolution??
Cheers, Chris.

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