When you try to open the help and support in vista you may receive an error saying that internet explorer can’t find the files
You try the following fix It re-associates the .xml file type with its default settings. Once you’ve merged this into the registry, re-launch Help and Support and it should work.
Open Notepad and copy the following and save this file as helpfix.reg
Windows Registry Editor Version 5.00
Now you need to double click on this this will run the above settings changes to your registry.
Another simple solution is try to download the above registry file and unzip and follow the readme file instructions.
Download From Here