Have you upgraded to the latest version of Inventory Solution? The latest is 6.2 SP3. There is a KB article detailing some errors with the custom inventory executable and Windows 2003.

https://kb.altiris.com/article.asp?article=36631&p=1

Here's the link to Inventory Solution 6.2 SP3 release notes:

https://kb.altiris.com/article.asp?article=47270&p=1

Hi,

Yes, I upgraded the solution but the message is still displayed, another idea?.

Thank you.

Are these windows 2003 servers?

Have you looked at this KB article:
https://kb.altiris.com/article.asp?article=36631&p=1

If you are logged into the server with the same credentials that are running the inventory, you would get this popup and since VS2005 is installed, you get prompted to debug.  However, a different user would get the normal AexCustInv has encountered a problem and needed to close" dialog.