I haven't bothered to look before .. But now that you mention it ...
I can't find the director for my C5280 either ???
I assume you loaded the appropriate Windows 7 software from HP's
support site.
See if you can run a scan using Windows Fax N Scan...
This will tell you if the HP drivers are loaded.
If no one knows ...
You might Email HP Scanner Support and ask them where they hid it.
photosmartptr_support_en@mail.support.hp.com
I use
Irfanview in place of the M$ Photoviewer .. and it also runs my Scanner