How can Safari be restored?

My system recently updated. Safari updated from 5.1.7 to 5.1.8.

From the get go things have been a little odd.

The first thing that I noticed is that the Safari icon disappeared. In its place is the unused/new app icon. After starting Safari, the icon does not change like icons usually do when an app starts for the first time.

The second thing that has happened is that I can no longer print fro safari. Hitting Command + P does not work. Selecting Print from the File menu does not work. The spinning colored wheel comes up and nothing happens. I can still close a window or Safari. I can still navigate through a page in another window. Safari doesn't freeze, it just doesn't print.

The third, and last thing, is that Safari appears to run a little more sluggishly, especially on startup.

Version 5.1.8 does not appear to be available as a direct download. If for some reason the installation was corrupted, it doesn't appear that I can redo it.

Version 5.1.7 will not install again since a newer version exists on this computer.

Any thoughts?

Thanks.

MacBook Pro 8,2

OS 10.6.8