Hi Beata2882,

Do as essexboy suggests,

We will need you to show hidden Files \Folders.
To do this:

  *Click Start.
  *Open My Computer.
  *Select the Tools menu and click Folder Options.
  *Select the View Tab.
  *Under the Hidden files and folders heading select Show hidden files and folders.
  *Uncheck the Hide protected operating system files (recommended) option.
  *Click Yes to confirm.
  *Click OK

I think this can be cleansed with a smitfraudfix, but let’s see what essexboy suggests,
I trust essexboy, he is a qualified malware cleaning expert, later you can have a second opinion by me,

polonus