I seacrhed around the internet, and found some one who has the exact some problem, he says this how he sloved it, but i dont clearly understand
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It was the registry, just as I had suspected. I had simply been overlooking one thing: I was leaving out the quotation marks around explorer.exe when identifying it in the registry as the startup shell [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]."