Although , Microsoft officially not going support Windows XP  but still many healthcare companies preferred to use windows XP internally. They buy windows 7 laptop and convert to Windows XP.This sounds funny but it true.

I was trying to use IE’s Developer tools(F12) to debug one of JavaScript issue found that “jscript.dll” has to be registered explicitly    to your machine.

even if i have IE8 and javsascript enabled on browser it was not stopping on breakpoint.

Solution : register jscript.sll
type “regsvr32 jscript.dll” on command prompt and your good to go.

All credit goes to
http://blog.codepyro.com/2009/11/having-frustrating-day-tring-to-get-ie7.html

More about debugging on IE
http://msdn.microsoft.com/library/dd565629(VS.85).aspx
http://msdn.microsoft.com/en-us/library/dd565625(v=vs.85).aspx

Thanks,

Suresh Behera