Please assist with odd error message

From: Neil (me_at_home.com)
Date: 01/31/04 

Date: Sat, 31 Jan 2004 12:48:21 +1100

Hi All,

I have a strange error message now appearing when I boot into XP Pro.

The message reads 'Windows cannot find '(null)'. Make sure you typed the
name correctly,
and then try again. To search for a file, click the Start button, and then
click Search.

The error dialogue box has no heading.

Any thoughts as to what might be causing it ??

Thanks.