From Dave's table talk:
http://docs.roxio.com/patches/pxengine4_18_16a.zip
His info:
http://blogs.adobe.com/davtechtable/2009/10/cs4_and_windows_7.html
What operating system and what version of Encore?
You generally should no longer need to manually install this, but there have been reports where it appeared to fix something.
Let us know if it helps.
The more important step for Encore is to "run as administrator."
