I'm no HP or Win7 expert, but was recently successful in finding drivers for Win7 for my nephew's HP printer. The process was convoluted because HP hasn't cross-referenced their regular driver pages with the new Win7 drivers pages. The place to start is the page called "HP and Windows® 7"
http://www.hp.com/united-states/windows7/index.html
Down on the lower right side, you'll see the usual search box for your product.
Search for HP software & drivers compatible with Windows® 7
Enter a product name/number
If you put your product name in there, it'll take you to the NEW product pages that include the brand-new (10-2009) driver page that includes Win7 and the other OSs.
For example, my nephew has a HP Photosmart C4400 Printer. His driver page is here:
http://h20180.www2.hp.com/apps/Lookup?h_query=photosmart+c4400&submit.x=12&submit.y=5&h_pagetype=s-002&h_lang=en&h_cc=us&cc=us&h_page=hpcom&lang=en&h_client=S-A-R163-1
and then here:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=3655574&lc=en&cc=us&dlc=en&submit.y=5&submit.x=12&lang=en&cc=us
Hopefully, HP will link the new pages to the old and this won't be necessary.
http://www.hp.com/united-states/windows7/index.html
Down on the lower right side, you'll see the usual search box for your product.
Search for HP software & drivers compatible with Windows® 7
Enter a product name/number
If you put your product name in there, it'll take you to the NEW product pages that include the brand-new (10-2009) driver page that includes Win7 and the other OSs.
For example, my nephew has a HP Photosmart C4400 Printer. His driver page is here:
http://h20180.www2.hp.com/apps/Lookup?h_query=photosmart+c4400&submit.x=12&submit.y=5&h_pagetype=s-002&h_lang=en&h_cc=us&cc=us&h_page=hpcom&lang=en&h_client=S-A-R163-1
and then here:
http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?product=3655574&lc=en&cc=us&dlc=en&submit.y=5&submit.x=12&lang=en&cc=us
Hopefully, HP will link the new pages to the old and this won't be necessary.