Input type=file in aspx page,access denied problem with windows xp sp 2 fix

I have a page with frames.
I have an Input type=file control for the user to upload files.
I have a required field validation control binded to this Input control.
I have a buton for submitting the page.
After updating my server with Windows XP sp2, I am facing a strange problem.
If I don't select a file or don't enter anything(for file path) or enter something without the backward slash("\") in the beginning, into the input control and click on the button(for submitting), the click event  of the button will not fire(I tried setting break point).
After this if I want to navigate to other links, I get a javascript error saying "Access denied" and nothing happens.
This happens only with XP,but the same problem doesn't occure with 2000 or NT.

Can anyone show some light on this.
Many thanks in advance.
Who is Participating?
COBOLdinosaurConnect With a Mentor Commented:
sp2 enforces the security that was always supposed to be there.  if you are getting access denied, it is either because you are trying to reference across frames thea are from the same domain or you are doing something to violate the secure nature of input type="file"

Can't tell much with out a link to the page or your code.

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