The smart collections defined by Adobe are barely worth having, and I'd question whether they're worth a reinstallation. I'd suggest you create your own to fit your needs.
If you really want to have them, create a new catalogue. This should create the default SCs. You can then right click them and save them as lrtemplate files wherever you want (eg to the desktop) which you can then import into your main catalogue.
But honestly, make your own.
John