You would need to make sure that your app runs with the 1.1 framework.
Generally, an app will run against the version of the framework it was built
against unless that version is not installed. However, you can use the
config file to ensure that the app uses a specific version of the run time
with the <requiredRuntime/> element. See the .NET Framework configuration
reference in MSDN for more details.

Note that this doesn't apply to ASP.NET apps. The runtime version used by
ASP.NET depends on how ASP.NET is configured. If you have multiple versions
of the framework installed on your web server, you can change this on a
vroot by vroot basis using the aspnet_regiis tool or by using the excellent
ASP.NET Version Switcher tool by Denis Bauer.

HTH,

Joe K.

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that all the users in this machine make use of .net 1.1 security profile?