Why is my DLL not working in Windows vista and Visual Studio 2008 ?

Hi!

Have made a DLL that is made in VB6.0.
This DLL have i used many times in different projects...
The different projects is running in Windows XP.... And
all the functions in DLL is working just fine.

But on my laptop, that use Windows Vista. I cant get the DLL to work ????
Is this maby a security issue in Vista ?

Using Visual Studio 2008, and try to add the dll file there.
Get this error message...

A reference to C:\secur\secureone.dll' could not be added.
Please make sure that the file is accessible and that it is a valid
assembly or COM component.

Please help me ASAP.

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