Mavericks won't open preview, app store, stickies

Hi,
I accidentally used Clean My Mac and forgot how it erases applications.   Anyways, I would like to use preview and can't.
I'd really like to download Yosemite but can't open the App store.  No, I didn't do time machine.  And switching user accounts doesn't help either.
Any ideas?
many thanks,
Mike

Backup first because you never know what might happen.
Boot into Recovery and Reinstall OS X.
OS X: About OS X Recovery - Apple Support
That should replace the lost parts and should not damage any of your files.

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