Hi,
I have ran ccleaner and now my Rainmeter files are gone :-(
Unable to activate skin ...File not found.
did you run the registry cleaner?
what is the missing file name?
did you hit Analyse to see what was going to be cleaned before you hit Run Cleaner?
but in short, something has been 'cleaned', if it's registry related and you did the offered backup, restore that backup .reg file.
if you didn't do a reg clean, something has been removed and is now gone for good.
you would need to either reinstall Rainmeter or download the missing skin (I'm not familiar with Rainmeter).