Gray snow, hides left top dots and blurs scroll bars, how can I repair this?

After I cleaned up my macbookair, by throwing away some unused software, the fill out fields and the red, yellow and green dots and scroll bar all turned into gray snow. Still works but I need to guess where the dot's are in the gray snow.
See this screenshot.
Anybody, can you tell me how to repair this? Re starting doen not help. closing and opening also does not work.
I am not sure if I have mountain lion, or so, at least I can't find where it should be.
I only have my macbook air two months now.
I did find information after clicking the apple in left upper corner that I use OS X 10.8.2

I Just re-installed itunes, and there the problem is gone.
But can I re-install Finder, Safari and App store? 
How, and how do I know what version I need?
Does de Apple site provide these downloads?

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