Help calling DTS package.

I'm new to using DTS packages and I'm running into a problem. Hopefully someone can help me out. I have an ASP.NET page that needs to call a DTS package. Everything seems to be working right up until I call opkg.Execute. The package seems to run but nothing happens. After further investigation I have found what looks like a permissions issue. this is the message I'm getting"
Error Number:
-2147467259 {Integer}

Error Description:
"The Microsoft Jet database engine cannot open the file ''. It is already opened exclusively by another user, or you need permission to view its data." {String}

This is obviously a permissions issue. I'm just not sure who the DTS package is running as and where to set the permissions.

Any ideas??

ThanksAfter a few modifications I'm getting a different error now. But it still is obviously a permissions problem. Everything I've read says set Impersonation equal to true. Unfortunately it already is. Any suggestions from you SQL Server gurus?

"Login failed for user '(null)'. Reason: Not associated with a trusted SQL Server connection."

Thankssql