problem with Excel automation

[Rajesh]

Hi ,
I have a strange problem while automating Excel XP with VC++
6.0.

The program has been working but few days ago ,

the program is not able to open excel in other systems which it used
to automate excel,its giving me a bug at this step itself

if(!app.CreateDispatch("Excel.Application"))
{
AfxMessageBox("Couldn't start Excel and get an application
0bject");
return;
}

so its obvious that its not able to created the Dispatch.

Its working on my computer when running in debug mode.But when I am
copying to other systems its not working.Earlier it used to work on
all of them.

Can some body pls help me with this.
Thanks in advance,
Rajesh