Dos windows not close up

[Vivi]

Hello,

This following window launch a Xcopy dos command, but the
window is not closing after the operation. (only with OS
win 98, 2000 and XP are ok )

Please I am stuck, what can I do ?

Thanks for your help
Code:
=====

if (osVersion.IndexOf("Windows 98",1) > 0) //Windows 98
{
compiler.StartInfo.FileName = "Xcopy32.exe";
compiler.StartInfo.Arguments = " " + @sWkDir + "\\" +
strNewHtmDir + " " + @sWkDir + "\\" + strDecompileChmDir +
" " + "/S /Y";
compiler.StartInfo.UseShellExecute = false;
compiler.StartInfo.CreateNoWindow = true;

compiler.Start();
while (!compiler.WaitForInputIdle(100))
{
Application.DoEvents(); }

// compiler.Kill();