Just-In-Time Debugging

Hi..
A window started to appear on my screen recently with the following:

In the title bar written (Just-In-Time Debugging)
Then (please select a debugger)
Then a small textbox (Possible debugger)
Inside the textbox the following (New instance of Microsoft script editor)
A check box (set the currently selected debugger as the default)

Then (do you want to debug using the selected debugger? Yes/ No)


I cant remove it off my screen its annoying, keep showing above all windows, If I press No It keep showing me it self, If I press Yes, Microsoft Script Editor would appear, and by the end of Debugging I'll get a message of Microsoft visual Studio debugger (Unknown exception) Break / Continue / Ignore / help.

What is this, any help plz.

OS : Windows XP.
PC: Dell Dimension 4100.