public static extern Int32 DriverPackageUninstall([MarshalAs(UnmanagedType.LPTStr)] string DriverPackageInfPath, Int32 Flags, IntPtr pInstallerInfo, out bool pNeedReboot);

Public Declare Auto Function DriverPackageUninstall Lib "DIFxAPI.dll" (ByVal DriverPackageInfPath As String, ByVal Flags As Int32, ByVal pInstallerInfo As IntPtr, ByRef pNeedReboot As Boolean) As Int32

Int32 UninstallResult = DriverPackageUninstall(infFile, Flags, ptrInstallerInfo, out fNeedReboot);

Dim UninstallResult As Int32 = DriverPackageUninstall(infFile, Flags, ptrInstallerInfo, fNeedReboot)