>Yes, I have a mscomm and Mike Lewis's simplelist which uses an active x I believe.

I have found this to happen in Vista too -- the culprit is that the active x is not registered on the machine. You may have installed it but it did not register. This occurs because the user ID to install did not have admin rights (I tried with users that had Admin but it still seemed to occur).

The way I was able to fix is to run the CMD command and explicitly select "Run as Administrator". Then run "regsvr32 mscomm.ocx" at the command line. This registered the active x and my program began to work.