@Kleidophoros did you say that you had lost the files and folders on your computer ?

If so then run this programme

Download RogueKiller to your desktop

[*]Quit all running programs
[*]For Vista/Seven, right click → run as administrator, for XP simply run RogueKiller.exe
[*]When prompted, type 6 and validate
[]The RKreport.txt shall be generated next to the executable.
[
]If the program is blocked, do not hesitate to try several times. If it really does not work (it could happen), rename it to winlogon.exe

Please post the contents of the RKreport.txt in your next Reply.