When I uninstall KernelEx was not writes back some entries in the registry. Sample [HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\SessionManager\KnownDLLs] "MSIMG32"="..\\KernelEx\\msimg32.dll" "PDH"="..\\KernelEx\\pdh.dll" "PSAPI"="..\\KernelEx\\psapi.dll" "UXTHEME"="..\\KernelEx\\uxtheme.dll" "WTSAPI32"="..\\KernelEx\\wtsapi32.dll" could fix that. thanks