Unable to open Preferences in Safari.

A Safe Mode boot deletes some system caches that may help after an OS X upgrade.

Top left corner of your screen click the Apple  > Shut Down.

After your Mac shuts down, wait 10 seconds, then press the power button.

Immediately after you hear the startup tone, hold down the Shift key. You should press the Shift key as soon as possible after you hear the startup tone, but not before.

Release the Shift key when you see the gray Apple logo and progress indicator.

Once you are in Safe Mode, go back to the Apple  menu. From the drop down menu click: Restart

Then try Safari.

About Safe Mode

Step 1?

Then you do need to reinstall the OS.

If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.

There are ways to back up a computer that isn't fully functional. Ask if you need guidance.

If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.

*The linked support article refers to OS X 10.10 ("Yosemite"), but the procedure is the same for OS X 10.7 ("Lion") and later.

Then follow the instructions posted by: Linc Davis to reinstall OS X earlier in this thread.

Just install.

How download safari browser on windows 7?

Apple stopped supporting Safari for Windows several years ago and it is no longer available.

This is interesting to me too as I bought a brand new PowerBook a few months ago and I haven't been able to open preferences in Safari from the get go... So I'll back everything up and try all of this.