The long struggled problem has come to an end this morning. Yeah, I had a problem in installing touchpad driver on my laptop Dell latitude E6400 with windows xp service pack 3 operating system.After searching on google with different keywords, finally I found a way to overcome the issue. Yes… its working nowJ.

Just rename or remove the file wdf01000.sys located at %systemroot%\system32\drivers\. Now run the setup, it will get installed successfully. I am not sure why dell is not fixing this issue.

Hope this helps somebody.