Very difficult to find out about it, it's in Greece? There are tons of windows like that, plainly impossible to remember them all by sight. You need to install English in order to get proper answers.
The c tells that you need administrator rights, not really a problem with Windows 7, although a major hindrance. CCleaner should not be a problem. You could try a restoration point for Windows, a point just before you installed CCleaner.
But honestly, I don't really understand the problem --- do excuse me, won't you?