Q: All Data Lost?

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Which OS is currently installed?  If you do not know, click the apple in the upper left corner>About this Mac.

michanfromok wrote:

 

I think it's OS X. 

They are all OS X, which version of OS X, 10.6.8, 10.8.5, 10.9.1?

Or some other?

And you have no backup?

It's likely that CleanMyMac did what it usually does and deleted the wrong things. In case you are tempted I will tell you never to use that type of app again, none work

You will have to reinstall OS X to get your system running again, you may or may not get your data back, no guarantees unfortunately.

Make backups in the future, daily ones. Time Machine is good for that.

You're welcome