Nagging box in xp

Hi,

I don't know what I did wrong but just recently when I start up my computer into win xp pro, just after the password prompt, a small box with a warning symbol appear in the middle of the screen with two options, yes or no. Other than that there is no message accompanying the box. So I can click either way, 'yes or no' and then I can get into windows.

I ran Norton AV and FixBlast.exe and they detected no virus. Is there a bootlog file in winxp pro so I can check where this box is coming from and just delete it?

Please help me.

P.S. I'm sorry I can't be any more specific and since this box occurs right after password prompt, PrtScn doesn't work so I can't attach foto.
 
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