See http://support.microsoft.com/kb/137809/en-us

>I Upgraded A Computer To A Pentium 4 3.0 Ghz With Windows Xp.
>
>Running A Custom Program Built On Vfp 3.0.
>
>Ran Fine Before The New Motherboard Came, However, Now I Am Getting Insufficient Memory Error When Trying To Run The Program.
>
>I Have Tried A Fresh Installation, But To No Avail.
>
>I Cannot Re-Engineer This Program, And Have Tried Setting The Properties Of The Icon For Backward Compatibility.
>
>Any Thoughts?
>
>Thanks In Advance.
>
>Becky