Sorry for the late reply.
Regarding the "Unable to delete file...", assuming the file is actually there, I'm not a windows expert... might be something related to the file being locked by another process or what?
Regarding the need for the installation, yes, JBossWS-CXF is the default, however Spring is not installed and shipped by default in JBoss AS 6 in order for not forcing users to have a given Spring implementation version in their server classpath. So, if you really need Spring (please note current JBossWS-CXF works fine without Spring except for some advanced features that are really built on top of it in Apache CXF), either you manually install it in JBoss AS, or you leverage the -Dspring=true option of JBossWS installation for doing that while updating/overwriting the jbossws stack. That's btw how we install jbossws-cxf w/ spring for test purposes.
With M4 it worked and with CR1 it wouldn't work. The permissions on the .\lib\endorsed\ directory is the same for both directories.
But to make it work, I just deleted all of the files in .\lib\endorsed\ before I run ant -Dspring=true deploy-jboss600 and it works fine... shrug...
Also when I unzip, I right click on the zip file in file explorer and select WinZip -> Extract to here