Hey All,
Just to let you know mine seems to have been fixed, this is what i recall doing yesterday
1. Deleted the iTunes App and Reinstalled, rebooted - Did not fix ( you need to set the permissions to remove it)
2. Deleted Avast Anti Virus, rebooted - did not fix (a lot of comments out there where Avast isn't the best, I've also had issues with other programmes not running due to avast)
3. Installed Avira Anti Virus after doing a bit of research (not really confident with it yet until something happens) - rebooted
4. Downloaded El Captain from App store and installed while i went to bed - Woke up this morning and its working.
Its worth mentioning I was using the Public Beta, so I'm now on the official public release not any beta.
Im not sure if you guys use Avast but if so its worth trying to remove this and reinstall El Captain, if it doesn't work put avast back on if you want to keep it.