I have sorted out the problem of failure to install some PhotoShop CS3 updates as follows:
I accessed and looked at Windows Vista Event Viewer and noted that logged errors involving Adobe product installs all mentioned Internal Error 2739.
A Google search for Error 2739 resulted in some helpful links, in particular these two:
<
http://kb.adobe.com/selfservice/viewContent.do?externalId=kb 401521&sliceId=1>
<
http://blog.kirupa.com/?p=85>
On the basis of information therein, as administrator I proceeded as follows:
1. Start> command prompt
2. enter regsvr32 jscript.dll
3. reinstall PhotoShop CS3 [successfull, including all components and shared components]
4. download all available PS CS3 updates and install [successful]
I hope this helps others