Uninstall antivirus BEFORE upgrading to Yosemite!

I guess this is just a word of advice for those upgrading (i.e. not doing a clean install) Mavericks to Yosemite.
It appears that antivirus and non Apple login items, may interfere with the installation of Yosemite.
Therefore: REMOVE ANTIVIRUS AND LOGIN ITEMS (System Preferences ==> Users and Groups ==> Login Items)
BEFORE YOU UPGRADE OR do a clean installation!
Regards

Yes, you are right,
Unfortunately it is our institution policy that all computers on premises must have an antivirus.
And yes, my macbook takes twice as much to start up.
Regards

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