blank popup appear when updating mac
Thank you for the report

Please disable the all following (from auto starting when you log in)


  iTunesHelper Application
  (/Applications/iTunes.app/Contents/MacOS/iTunesHelper.app) 


uTorrent


  Application (/Applications/uTorrent.app) 


AdobeResourceSynchronizer


  Application (/Applications/Adobe
  Reader.app/Contents/Support/AdobeResourceSynchronizer.app) 


RealPlayer


  Downloader Agent Application (/Users/[redacted]/Library/Application
  Support/RealNetworks/RealPlayer Downloader Agent.app)


How to do that:

Go to system preferences- user&amp; groups- you will see your log in profile. Click on the Log in items and disable anything using the (-) sign to remove.

Restart your system. If the MPlayer is still running STOP it. To do that press 3 keys all together [alt (option)+ cmd +esc]. A new widow will show where you can select the MPlayer and force quit it.

Finally lets repair your User profile.

Hold cmd+r during restarting of the computer

You will boot into the Repair Utilities screen. 

On top, in the Menu Bar click the Utilities item then select Terminal.

New window - type resetpassword

You will not reset the password but:

Instead, click on the icon for your Mac’s hard drive at the top. From the drop-down below it, select the user account where you are having issues.

At the bottom of the window, you’ll see an area labeled ‘Reset Home Directory Permissions and ACLs’. Click the Reset button there.


The reset process takes a couple of minutes. When it’s done, quit the programs you’ve opened and restart your Mac. 

If none of the above worked I am afraid you will need to restore your Mavericks first before Installing Yosemite. To that use the cmd+r again and follow the instructions how to restore. Normally you data will not be touched during this process, but if you have back up it is better.