This is an error commonly witnessed when you try to uninstall a program using the "Add or Remove Programs" in Microsoft
Windows XP. The message itself will read: "Error 1721. There is a problem with this
Windows Installer package. A program required for this install to complete could not be run. Contact your support personal or package vendor."
I Googled your error and this is what I got. As far as your update question, I think you can just go to HP website, and redownload and reinstall all the updates that you are in need of. If you are speaking of Windows Updates, you can redownload those to. Just go to Microsoft website and in their search box, type in reinstall updates; of course, you will also have to type in there which updates you need to reinstall. Hope this helps.
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