Just to confirm, after the error, did you attempt to reinstall again over-the-top of the existing installation? I have been seeing issues in OSX 10.9.3 and 10.9.4 where the pgpwde.kext for some reason fails to install the first time through, but on a second attempt it does work.
Let me know what the results of an over-the-top reinstall are, and we can go from there.
As far as the original post, 10.3.0 mp3 was not verified against OS X 10.9 or any of the point fixes for 10.9. SED 10.3.1 was the first build verified for OS X 10.9, and now that you are moving to 10.10, it would be vital that you are trying the latest version of SED (10.3.2 mp2). Even then, there is not yet any official support for OS X 10.10. See the following for more details:
http://www.symantec.com/docs/TECH174563