@duesi
My WinUAE 0.8.22.R3 works fine with WinXP Pro-SP1.
WinUAE 0.8.22.R4 is too buggy in my opinion i.e. timing bugs and sound corruptions.
Is there a solution ? (I get a red screen at bootup and than it crashes...
What WinUAE version are you running?
A red boot screen indicates there's an error in your ROMs.