To Enabling or disabling just in time debugger, which in some case very disturbing me....:P, after search on site i found it in msdn site this is the detail:
To enable/disable Just-In-Time debugging
On the Tools menu, click Options.
In the Options dialog box, select the Debugging folder.
In the Debugging folder, select the Just-In-Time page.
In the Enable Just-In-Time debugging of these types of code box, select or clear the relevant program types: Managed, Native, or Script.
To disable Just-In-Time debugging, once it has been enabled, you must be running with Administrator privileges. Enabling Just-In-Time debugging sets a registry key, and Administrator privileges are required to change that key.
Click OK.