First of all you're not talking to Apple tech support here. Just other users like yourself, who freely donate their time to help.
Quit System Preferences
Go to your Finder "Go" menu hold the option key to choose "Library" and delete these files/folders:
/Preferences/com.apple.system preferences .plist
/Preferences/By Host/com.apple.systempreferences.xxx.plist of them)
Try starting in Safe Mode and see if the problem still occurs?
Restart holding the "shift" key.
(Expect it to take longer to start this way because it runs a directory check first.)
If this works look in System Preferences > Users & Groups > Login items and delete any third party login items (-), you can always add them back with the (+). Also look in /Library/Startup Items. Nothing is put in that folder by default, so anything in there is yours.